Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131363
F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed
We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord D(ρ), reflected entropy ER(ρ), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with –6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement ER(ρ) decouples dynamically from overall quantumness D(ρ), suggesting new routes to correlation-selective, fault-tolerant quantum control.
{"title":"A hierarchy of quantum control and the dissociation of entanglement from quantum discord","authors":"F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed","doi":"10.1016/j.physleta.2026.131363","DOIUrl":"10.1016/j.physleta.2026.131363","url":null,"abstract":"<div><div>We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord <em>D</em>(<em>ρ</em>), reflected entropy <em>E<sub>R</sub></em>(<em>ρ</em>), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with <span><math><mrow><mi>N</mi><mo>=</mo><mn>2</mn></mrow></math></span>–6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement <em>E<sub>R</sub></em>(<em>ρ</em>) decouples dynamically from overall quantumness <em>D</em>(<em>ρ</em>), suggesting new routes to correlation-selective, fault-tolerant quantum control.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131363"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131383
Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong
The effect of impurity ions on turbulence, mean and zonal flow dynamics has been studied in HL-2A ohmically-heated deuterium plasmas by a combined Langmuir probe array. Results show that the fluctuating level of geodesic acoustic mode (GAM) zonal flows has an obvious reduction, while the GAM frequency remains nearly unchanged after the impurity injection. Further analysis demonstrates that with impurity injection the GAM zonal flows gain less energy from the high frequency fluctuations in 300-500 kHz due to the reduction of eddies titling angle and shape stretched by E × B mean flow through the so-called vortex thinning process, concurrently the turbulent transport concentrated in 15-100 kHz increases, indicating that electrostatic fluctuations driving zonal flows and fluctuations responsible for the particle transport originate from different instabilities. These experimental results reveal the critical role of mean flow in mediating the inverse cascade from small scale turbulence to large scale zonal flows as well as its coupling with turbulent transport. This study could advance our understanding of fundamental physics on the multi-scale interaction and its implication for controlling turbulent transport through impurity ions in future fusion plasmas.
{"title":"Effect of impurity ions on interplay between turbulence, mean and zonal flows in toroidal magnetized plasmas","authors":"Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong","doi":"10.1016/j.physleta.2026.131383","DOIUrl":"10.1016/j.physleta.2026.131383","url":null,"abstract":"<div><div>The effect of impurity ions on turbulence, mean and zonal flow dynamics has been studied in HL-2A ohmically-heated deuterium plasmas by a combined Langmuir probe array. Results show that the fluctuating level of geodesic acoustic mode (GAM) zonal flows has an obvious reduction, while the GAM frequency remains nearly unchanged after the impurity injection. Further analysis demonstrates that with impurity injection the GAM zonal flows gain less energy from the high frequency fluctuations in 300-500 kHz due to the reduction of eddies titling angle and shape stretched by E × B mean flow through the so-called vortex thinning process, concurrently the turbulent transport concentrated in 15-100 kHz increases, indicating that electrostatic fluctuations driving zonal flows and fluctuations responsible for the particle transport originate from different instabilities. These experimental results reveal the critical role of <span><math><mrow><mi>E</mi><mo>×</mo><mi>B</mi></mrow></math></span> mean flow in mediating the inverse cascade from small scale turbulence to large scale zonal flows as well as its coupling with turbulent transport. This study could advance our understanding of fundamental physics on the multi-scale interaction and its implication for controlling turbulent transport through impurity ions in future fusion plasmas.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131383"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131355
Zhaoyan Xu
The concept of soliton gas has become well-known in recent years and the soliton gas has been studied by using various methods. The letter will approach this topic from a perspective of mathematical physics by constructing a Thermodynamic Bethe Ansatz model, treating N-soliton solutions of the Sawada-Kotera equation as N quasi-particles. As the number N of the solitons approaches infinity, the N-soliton system will evolve into a soliton gas of the Sawada-Kotera equation. By deriving the corresponding physical concepts, the kinetic equation associated with this soliton gas is derived immediately. This work will inspire the study of soliton gas of other physically important integrable systems.
{"title":"The generalized hydrodynamic framework for the Sawada-Kotera equation and its kinetic equations","authors":"Zhaoyan Xu","doi":"10.1016/j.physleta.2026.131355","DOIUrl":"10.1016/j.physleta.2026.131355","url":null,"abstract":"<div><div>The concept of soliton gas has become well-known in recent years and the soliton gas has been studied by using various methods. The letter will approach this topic from a perspective of mathematical physics by constructing a Thermodynamic Bethe Ansatz model, treating <em>N</em>-soliton solutions of the Sawada-Kotera equation as <em>N</em> quasi-particles. As the number <em>N</em> of the solitons approaches infinity, the <em>N</em>-soliton system will evolve into a soliton gas of the Sawada-Kotera equation. By deriving the corresponding physical concepts, the kinetic equation associated with this soliton gas is derived immediately. This work will inspire the study of soliton gas of other physically important integrable systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131355"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131347
Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo
A deep understanding of coherent transport through a double quantum dot (DQD) is essential to the design of a quantum device. In this work, we investigate the nonequilibrium transport of particles and energy through a DQD by employing the full counting statistics framework, which is established based on a generalized quantum master equation (GQME) without the secular approximation. We demonstrate the unique advantage of our approach in the regime of small interdot couplings, where quantum coherence gives rise to a strong charge localization in the DQD, leading intriguingly to a prominent super-Poissonian noise. We reveal that the frequency-dependent noise of the energy current is a sensitive indicator of quantum coherence, which offers the possibility to identify the bath-induced or the tunnel coupling-induced decoherences. These findings highlight the importance of utilizing a GQME without the secular approximation for an appropriate description of energy and charge transport through DQD devices.
{"title":"Full counting statistics of charge and energy transport through a double quantum dot system beyond secular approximation","authors":"Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo","doi":"10.1016/j.physleta.2026.131347","DOIUrl":"10.1016/j.physleta.2026.131347","url":null,"abstract":"<div><div>A deep understanding of coherent transport through a double quantum dot (DQD) is essential to the design of a quantum device. In this work, we investigate the nonequilibrium transport of particles and energy through a DQD by employing the full counting statistics framework, which is established based on a generalized quantum master equation (GQME) without the secular approximation. We demonstrate the unique advantage of our approach in the regime of small interdot couplings, where quantum coherence gives rise to a strong charge localization in the DQD, leading intriguingly to a prominent super-Poissonian noise. We reveal that the frequency-dependent noise of the energy current is a sensitive indicator of quantum coherence, which offers the possibility to identify the bath-induced or the tunnel coupling-induced decoherences. These findings highlight the importance of utilizing a GQME without the secular approximation for an appropriate description of energy and charge transport through DQD devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131347"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131379
Igor N. Karnaukhov
Within the framework of a model, that takes into account two-particle hybridization of conduction and localized electrons, the effective interaction between conduction electrons is calculated. It is shown that this interaction leads to attractive effective interaction between conduction electrons when the energy of the localized electron corresponding to the two-particle state lies in the conduction band above the Fermi energy. The magnitude of the attractive interaction is minimal for η-paired states of conduction electrons. We generalize the original η-pairing construction for the proposed model and show that the superconducting state can indeed be realised. With high probability, it is the η-pairing of conduction electrons, arising from their two-particle hybridization with localized electrons, are realized in high-temperature superconductors.
{"title":"η -pairing in the model with two-particle hybridization of conduction and localized electrons","authors":"Igor N. Karnaukhov","doi":"10.1016/j.physleta.2026.131379","DOIUrl":"10.1016/j.physleta.2026.131379","url":null,"abstract":"<div><div>Within the framework of a model, that takes into account two-particle hybridization of conduction and localized electrons, the effective interaction between conduction electrons is calculated. It is shown that this interaction leads to attractive effective interaction between conduction electrons when the energy of the localized electron corresponding to the two-particle state lies in the conduction band above the Fermi energy. The magnitude of the attractive interaction is minimal for <em>η</em>-paired states of conduction electrons. We generalize the original <em>η</em>-pairing construction for the proposed model and show that the superconducting state can indeed be realised. With high probability, it is the <em>η</em>-pairing of conduction electrons, arising from their two-particle hybridization with localized electrons, are realized in high-temperature superconductors.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131379"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To investigate the coexistence of superconductivity and charge density wave (CDW) in a correlated regime, we employ the Green’s functions formalism, as well as the Hubbard-I approximation, as a way to introduce the correlations into the problem, in the form of a repulsive Coulomb interaction U. In addition, we investigate the effects of second-nearest neighbor hopping t1 on a pure CDW state. The analysis of the results show that, for small values of t1, both CDW and superconducting gaps compete for the same region on the Fermi surface. The increase of t1 decreases the competition and may lead the system to a coexistence regime. Effects of temperature in the coexistence regime, are also investigated.
{"title":"Coexistence of superconductivity and charge density wave in a correlated regime","authors":"E.J. Calegari , L.C. Prauchner , A.C. Lausmann , S.G. Magalhaes","doi":"10.1016/j.physleta.2026.131380","DOIUrl":"10.1016/j.physleta.2026.131380","url":null,"abstract":"<div><div>To investigate the coexistence of superconductivity and charge density wave (CDW) in a correlated regime, we employ the Green’s functions formalism, as well as the Hubbard-I approximation, as a way to introduce the correlations into the problem, in the form of a repulsive Coulomb interaction <em>U</em>. In addition, we investigate the effects of second-nearest neighbor hopping <em>t</em><sub>1</sub> on a pure CDW state. The analysis of the results show that, for small values of <em>t</em><sub>1</sub>, both CDW and superconducting gaps compete for the same region on the Fermi surface. The increase of <em>t</em><sub>1</sub> decreases the competition and may lead the system to a coexistence regime. Effects of temperature in the coexistence regime, are also investigated.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131380"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-16DOI: 10.1016/j.physleta.2026.131371
Jin-Fang Li , Yilou Liu , Dong-Shan He , Zuo-Yuan Zhang , Xiao-Tao Xie
Quantum optimal control is essential for realizing quantum computing, and the task is constructing high-fidelity quantum logic gates. Among the fundamental operations for qubit manipulation, Pauli gates play a pivotal role. In this study, we employ a multi-constrained quantum control method to investigate the phase modulation in spin-1/2 system for Pauli gates. Our results demonstrate that Pauli gates achieve target state preparation with fidelities above 0.9999 for selected initial states, where final population closely match theoretical predictions. Furthermore, we analyze phase control in specific quantum states. Theoretically, the Pauli-X gate induces a phase sign inversion, whereas Pauli-Y and Pauli-Z gates produce relative phases. Our optimized results show phase deviations within 0.0164π of theoretical values. Moreover, high fidelity can be maintained even when population is effected by initial phases. These phase evolution characteristics provide valuable guidance for optimizing quantum operations and improving computational accuracy.
{"title":"Optimization of Pauli operations for numerical analysis of quantum state’s relative phase in spin-1/2 quantum system","authors":"Jin-Fang Li , Yilou Liu , Dong-Shan He , Zuo-Yuan Zhang , Xiao-Tao Xie","doi":"10.1016/j.physleta.2026.131371","DOIUrl":"10.1016/j.physleta.2026.131371","url":null,"abstract":"<div><div>Quantum optimal control is essential for realizing quantum computing, and the task is constructing high-fidelity quantum logic gates. Among the fundamental operations for qubit manipulation, Pauli gates play a pivotal role. In this study, we employ a multi-constrained quantum control method to investigate the phase modulation in spin-1/2 system for Pauli gates. Our results demonstrate that Pauli gates achieve target state preparation with fidelities above 0.9999 for selected initial states, where final population closely match theoretical predictions. Furthermore, we analyze phase control in specific quantum states. Theoretically, the Pauli-X gate induces a phase sign inversion, whereas Pauli-Y and Pauli-Z gates produce relative phases. Our optimized results show phase deviations within 0.0164<em>π</em> of theoretical values. Moreover, high fidelity can be maintained even when population is effected by initial phases. These phase evolution characteristics provide valuable guidance for optimizing quantum operations and improving computational accuracy.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131371"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-15DOI: 10.1016/j.physleta.2026.131374
Bandari Rashmi , Srivani Javvaji , S. Shravan Kumar Reddy , P. Rambabu , Srinivasa Rao Pathipati
We present a comprehensive study of the structural, electronic, mechanical, and thermoelectric properties of the ternary nitride compound Sr2ZnN2 using first-principles density functional theory (DFT) combined with semi-classical Boltzmann transport theory. The compound is found to be dynamically and mechanically stable, as confirmed by phonon dispersion and elastic constant calculations satisfying the Born–Huang criteria. The electronic structure, computed using the modified Becke–Johnson (mBJ) potential, reveals a direct bandgap of 1.574 eV. Mechanical analysis indicates ductile behavior, supported by positive Cauchy pressure, Poisson’s ratio, and Pugh’s ratio. Thermal transport analysis shows that acoustic phonon scattering is the dominant scattering mechanism affecting charge carrier mobility, while ionized impurity and polar optical phonon scattering contribute minimally. The lattice thermal conductivity, estimated using Slack’s approximation, decreases with increasing temperature, supporting its potential for thermoelectric applications. These findings highlight Sr2ZnN2 as a mechanically robust and electronically promising material with potential for moderate thermoelectric performance.
{"title":"Ab-initio study of structural, electronic, mechanical, and thermoelectric properties of Sr2ZnN2","authors":"Bandari Rashmi , Srivani Javvaji , S. Shravan Kumar Reddy , P. Rambabu , Srinivasa Rao Pathipati","doi":"10.1016/j.physleta.2026.131374","DOIUrl":"10.1016/j.physleta.2026.131374","url":null,"abstract":"<div><div>We present a comprehensive study of the structural, electronic, mechanical, and thermoelectric properties of the ternary nitride compound Sr<sub>2</sub>ZnN<sub>2</sub> using first-principles density functional theory (DFT) combined with semi-classical Boltzmann transport theory. The compound is found to be dynamically and mechanically stable, as confirmed by phonon dispersion and elastic constant calculations satisfying the Born–Huang criteria. The electronic structure, computed using the modified Becke–Johnson (mBJ) potential, reveals a direct bandgap of 1.574 eV. Mechanical analysis indicates ductile behavior, supported by positive Cauchy pressure, Poisson’s ratio, and Pugh’s ratio. Thermal transport analysis shows that acoustic phonon scattering is the dominant scattering mechanism affecting charge carrier mobility, while ionized impurity and polar optical phonon scattering contribute minimally. The lattice thermal conductivity, estimated using Slack’s approximation, decreases with increasing temperature, supporting its potential for thermoelectric applications. These findings highlight Sr<sub>2</sub>ZnN<sub>2</sub> as a mechanically robust and electronically promising material with potential for moderate thermoelectric performance.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131374"},"PeriodicalIF":2.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-15DOI: 10.1016/j.physleta.2026.131376
B. Kh. Turmanov , F. Kh. Abdullaev , F.Z. Isakov
The dynamics and spectrum of the impurity immersed in a quasi-one-dimensional dipolar Bose-Einstein condensate (BEC) are investigated. The case when a two-soliton molecule state exists in a dipolar BEC is considered. If the interaction between an atomic impurity and bosons is attractive, the soliton molecule (SM) of the BEC generates an effective double-well potential for the impurity. The spectrum of the impurity in this effective potential is found. The results are verified through direct numerical simulations of coupled Gross-Pitaevskii equations. The nonstationary processes, such as impurity oscillations, due to quantum tunneling, are analyzed. Numerical simulations of the full system confirm predictions for the frequency of impurity oscillations.
{"title":"Atomic impurity in a quasi-one-dimensional dipolar Bose-Einstein condensate","authors":"B. Kh. Turmanov , F. Kh. Abdullaev , F.Z. Isakov","doi":"10.1016/j.physleta.2026.131376","DOIUrl":"10.1016/j.physleta.2026.131376","url":null,"abstract":"<div><div>The dynamics and spectrum of the impurity immersed in a quasi-one-dimensional dipolar Bose-Einstein condensate (BEC) are investigated. The case when a two-soliton molecule state exists in a dipolar BEC is considered. If the interaction between an atomic impurity and bosons is attractive, the soliton molecule (SM) of the BEC generates an effective <em>double-well potential</em> for the impurity. The spectrum of the impurity in this effective potential is found. The results are verified through direct numerical simulations of coupled Gross-Pitaevskii equations. The nonstationary processes, such as impurity oscillations, due to quantum tunneling, are analyzed. Numerical simulations of the full system confirm predictions for the frequency of impurity oscillations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131376"},"PeriodicalIF":2.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-15DOI: 10.1016/j.physleta.2026.131372
Chen Wang, Shi-Fan Qi
In this work, we propose a two-mode squeezing generation scheme in a hybrid three-mode cavity optomechanical system, where a mechanical resonator couples to two microwave (or optical) photon modes. By applying modulated strong drives, we derive an effective Hamiltonian that describes mechanically mediated two-photon squeezing, which is validated by diagonalizing the system’s transition matrix in the Heisenberg picture. Our analysis reveals that stable two-mode squeezing can be achieved by optimizing the squeezing operator even in unsteady-state dynamics, with the squeezing level exceeding the maximum achievable under system stability conditions while maintaining the anti-squeezing at a proper level within a suitable time interval. Furthermore, we show that our protocol is robust against systematic errors in both driving intensity and frequency, as well as against thermal Markovian noises. Our work presents an extendable approach for generating two-mode squeezed states between indirectly coupled bosonic modes.
{"title":"Dynamically stable two-mode squeezing in cavity optomechanics","authors":"Chen Wang, Shi-Fan Qi","doi":"10.1016/j.physleta.2026.131372","DOIUrl":"10.1016/j.physleta.2026.131372","url":null,"abstract":"<div><div>In this work, we propose a two-mode squeezing generation scheme in a hybrid three-mode cavity optomechanical system, where a mechanical resonator couples to two microwave (or optical) photon modes. By applying modulated strong drives, we derive an effective Hamiltonian that describes mechanically mediated two-photon squeezing, which is validated by diagonalizing the system’s transition matrix in the Heisenberg picture. Our analysis reveals that stable two-mode squeezing can be achieved by optimizing the squeezing operator even in unsteady-state dynamics, with the squeezing level exceeding the maximum achievable under system stability conditions while maintaining the anti-squeezing at a proper level within a suitable time interval. Furthermore, we show that our protocol is robust against systematic errors in both driving intensity and frequency, as well as against thermal Markovian noises. Our work presents an extendable approach for generating two-mode squeezed states between indirectly coupled bosonic modes.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131372"},"PeriodicalIF":2.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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