Fiber loop quantum buffer for photonic qubits

IF 2.8 2区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY New Journal of Physics Pub Date : 2024-08-11 DOI:10.1088/1367-2630/ad6703
Kim Fook Lee, Gamze Gül, Zhao Jim and Prem Kumar
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Abstract

We report a fiber loop quantum buffer based on a low-loss 2 × 2 switch and a unit delay made of a fiber delay line. We characterize the device by using a two-photon polarization entangled state in which one photon of the entangled photon pair is stored and retrieved at a repetition rate up to 78 kHz. The device, which enables integer multiples of a unit delay, can store the qubit state in a unit of fiber delay line up to 5.4 km and the number of loop round-trips up to 3. Furthermore, we configure the device with other active elements to realize integer multiplier and divider of a unit delay of a qubit. The quantum state tomography is performed on the retrieved photon and its entangled photon. We obtain a state fidelity 94 with a maximum storage time of 52 s with an insertion loss of 5.56 dB. To further characterize the storing and retrieving processes of the device, we perform entanglement-assisted quantum process tomography on the buffered qubit state. The process fidelity of the device is 0.98. Our result implies that the device preserves the superposition and entanglement of a qubit state from a two-photon polarization-entangled state. This is a significant step towards facilitating applications in optical asynchronous transfer mode based quantum networks.
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用于光子量子比特的光纤环量子缓冲器
我们报告了一种基于低损耗 2 × 2 开关和光纤延迟线单位延迟的光纤环量子缓冲器。我们利用双光子偏振纠缠态对该器件进行了表征,其中纠缠光子对中的一个光子以高达 78 kHz 的重复率进行存储和检索。此外,我们还将该器件与其他有源元件配置在一起,以实现量子比特单位延迟的整数倍乘法和除法。量子态层析成像是在检索到的光子及其纠缠光子上进行的。我们获得了状态保真度 94,最大存储时间为 52 秒,插入损耗为 5.56 dB。为了进一步描述该器件的存储和检索过程,我们对缓冲量子比特态进行了纠缠辅助量子过程层析成像。该器件的过程保真度为 0.98。我们的结果表明,该器件保留了来自双光子偏振纠缠态的量子比特态的叠加和纠缠。这是促进基于光异步传输模式的量子网络应用的重要一步。
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来源期刊
New Journal of Physics
New Journal of Physics 物理-物理:综合
CiteScore
6.20
自引率
3.00%
发文量
504
审稿时长
3.1 months
期刊介绍: New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
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