Advanced quantum technologies最新文献

Nonlinear effect, which is induced by probe lightatom ensemble interaction, can significantly influence the performance of atomic magnetometers. The cover image shows the nonlinear interaction process between linear-polarized light and atomic ensemble operated in the spin-exchange relaxation-free regime. In article number 2400226, Jixi Lu, Bozheng Xing, and co-workers first propose that the nonlinear effect could be effectively suppressed by optimizing saturation parameters, which causes significant improvement in probe sensitivity of the atomic magnetometer.

Current research in quantum matter is strongly focused on quantum computing, communication and the quantum internet. The cover shows an artist's impression of the non-classical Fock state field in a single-mode resonator (red) operating at one frequency being directed to the input of a qubit controller (middle part) and subsequently converted to the desired non-classical (e.g. N00N state) field (green) in an output single-mode resonator operating at another frequency. The results described by Dmitry Yakovlev and co-workers in article number 2400141 open up exciting new possibilities for the quantum connection between solid-state and photonic flying qubits, enabling all-quantum data processing and data transfer.

Light–matter interaction can bridge critical phenomena, topological transitions, quantum metrology, and non-Hermitian physics, bringing novel implications. In non-Hermitian Jaynes–Cummings models with PT and anti-PT symmetries, the quantum Fisher information manifests criticality and super-universality around exceptional points (as shown in article number 2400288 by Zu-Jian Ying), providing a universally high sensitivity resource for quantum metrology. The simultaneous occurrence of conventionally incompatible critical Landau-class transition and topological transition is realized, with conceptional renovation and more potential in designing quantum sensors.

Superconducting diodes with nonreciprocal transport effect enable constructing novel logic devices, thereby laying the cornerstone of contemporary integrated circuits technology beyond Josephson junction-based circuits. Xiaofu Zhang, Lixing You, and co-workers designed and fabricated novel superconducting diodes based on the minimal superconducting electrical component – the superconducting nanowire –, which can rectify both square-wave and sine-wave signals without distortion (see article number 2300378). The superconducting nanowire diodes are irrespective of specific superconducting materials, and therefore promising for constructing low-dissipation superconducting integrated circuits for novel computation architectures.

A diamond quantum sensor, based on an ensemble of nitrogen-vacancy (NV) centers in diamond, is depicted being held by the author's hand. This sensor module is compact, highly magnetically sensitive, and stable. It was achieved by mounting a ¹²C-enriched chemical vapor deposition diamond, optics for high collection efficiency of NV fluorescence, and a balancing circuit to cancel out laser noise in the sensor module. This compact module is expected to be versatile across a broad spectrum of applications. For further information on the device and its applications, see article number 2300456 by Yuta Kainuma, Takayuki Iwasaki, and co-workers.

In article number 2400111, Zhu-Cheng Zhang, Yi-Ping Wang, and co-workers propose a scheme for implementing a one-dimensional cavity magnonics lattice that exhibits quantum magnon–photon Hall insulator behaviors. By adjusting corresponding parameters, different energy spectrum structures can be triggered, and the flipping of edge states can be observed, enabling multi-channel topological quantum state transmission.

This cover image illustrates the generation of microwave waveforms for qubit control by transforming superconducting single-flux-quantum (SFQ) pulses through a filtering network. The output microwave can be modulated by managing the condition of an SFQ pulse pair. Specifically, the reverse-polarity pulse-pair (RPPP) method enables maximum output amplitude and precise control over the initial phase of the microwave. This approach facilitates on-chip qubit control in a cryogenic environment, significantly reducing thermal noise and interconnecting cables, which is crucial for large-scale quantum computing. For further details see article number 2400001 by Hongxiang Shen, Yuxing He, Nobuyuki Yoshikawa, and co-workers.

In article number 2400043, Hai-Chao Li, Wei Xiong, and co-workers first propose to achieve nonreciprocal unconventional photon blockade with Kerr magnons. By tuning the direction of the biased magnetic field, the Kerr coefficient can be opposite, giving rise to nonreciprocity. With such a nonreciprocal nonlinearity, direction-dependent unconventional photon blockade, destructively interfering between two transition paths, can be realized in single- and two-sphere cavity–magnon systems. By tuning magnon–photon coupling, reciprocal and nonreciprocal photon blockade can be arbitrarily switched for two-sphere setup. This study offers a potential platform for investigating nonreciprocal photon blockade effect with Kerr magnons.