Sonali Gera, Chase Wallace, Mael Flament, Alessia Scriminich, Mehdi Namazi, Youngshin Kim, Steven Sagona-Stophel, Giuseppe Vallone, Paolo Villoresi, Eden Figueroa
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引用次数: 0
摘要
量子中继网络需要能够存储和检索无差别光子的独立吸收式量子存储器,以执行高重复纠缠交换操作。在室温下执行这些相干操作的能力对于实现可扩展量子网络至关重要。我们在光子偏振态与从两组独立室温量子存储器中存储和检索的单光子级脉冲之间进行了弘欧芒德(HOM)干涉。我们的研究表明,在双轨配置中,从量子存储器中存储和检索偏振态不会降低少光子级偏振态的 HOM 可见度。对于单光子级脉冲,我们测量了单偏振、单轨量子力学中各种背景水平下的 HOM 可见度,并研究了其与信号-背景比的关系。我们得到的 HOM 可见度为 43%,而我们设置的无记忆极限为 48%。根据这些结果,我们可以估算出在相同条件下极化量子比特的可见度为 33%。这些演示为未来使用大规模内存辅助量子网络的应用奠定了基础。
Hong-Ou-Mandel interference of single-photon-level pulses stored in independent room-temperature quantum memories
Quantum repeater networks require independent absorptive quantum memories capable of storing and retrieving indistinguishable photons to perform high-repetition entanglement swapping operations. The ability to perform these coherent operations at room temperature is of prime importance for the realization of scalable quantum networks. We perform Hong-Ou-Mandel (HOM) interference between photonic polarization states and single-photon-level pulses stored and retrieved from two sets of independent room-temperature quantum memories. We show that the storage and retrieval of polarization states from quantum memories does not degrade the HOM visibility for few-photon-level polarization states in a dual-rail configuration. For single-photon-level pulses, we measure the HOM visibility with various levels of background in a single polarization, single-rail QM, and investigate its dependence on the signal-to-background ratio. We obtain an HOM visibility of 43%, compared to the 48% no-memory limit of our set-up. These results allow us to estimate a 33% visibility for polarization qubits under the same conditions. These demonstrations lay the groundwork for future applications using large-scale memory-assisted quantum networks.
期刊介绍:
The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.