Entanglement based quantum key distribution over long distances using hybrid entangled states

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日期	2024-03-11

時間	12:10-13:10

地點	理學教學新大樓物理系1F 36173會議室

領域	Quantum Information Science

講者	Jaskaran Singh 博士 (成功大學物理系)

題目	Entanglement based quantum key distribution over long distances using hybrid entangled states

摘要	In this talk, I will provide a general introduction to entanglement based quantum key distribution (QKD), which so far has only been studied in either fully discrete variable (DV) systems (like polarization of photons) or in fully continuous variable (CV) systems (like squeezed coherent states). I will discuss the advantages and disadvantages of using both systems. After this introduction, I will introduce a scheme which uses the advantages of both DV and CV systems to produce long-distance entanglement, which can then be used for QKD. The key idea is for Alice and Bob to first prepare entanglement between DV and CV systems locally, known as hybrid entanglement (HE). Then, we use the CV part for increasing the transmission distance, while we use the DV part for achieving high key rates. This way it is possible to achieve upto 300 km of transmission distances even with realistic sources of error. Moreover, this also points out that HE states provide a clear advantage for practical long-distance high-rate entanglement.

2024-03-11 12:10:00 ~ 2024-03-11 13:10:00