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arXiv 2307.02149quant-phphysics.optics
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在自由空间BBM92量子密钥分发协议中使用非最大纠缠态

Use of Non-Maximal entangled state for free space BBM92 quantum key distribution protocol

Ayan Biswas, Sarika Mishra, Satyajeet Patil, Anindya Banerji, Shashi Prabhakar, Ravindra P. Singh

AI总结:

本文研究自由空间BBM92量子密钥分发协议中非最大纠缠态对安全性的影响,建立了无法提取安全密钥的非最大性下界,并发现Bell-CHSH不等式违背程度与量子比特误码率之间存在线性关系。

摘要:

基于卫星的量子通信用于安全密钥分发,因其不可破解的安全性而成为一个需求日益增长的研究领域。诸如BB84这类制备与测量协议将卫星视为可信设备,鉴于当前卫星光通信的发展趋势,这种做法充满危险。因此,必须优先采用基于纠缠的协议,因为这类协议除了能够克服距离限制之外,还可以将卫星视为不可信设备。E91协议是卫星量子通信的一个良好候选方案;但其密钥率较低,因为大多数被测量的量子比特被用于验证Bell-CHSH不等式,以确保对Eve的安全性。基于纠缠的协议需要最大纠缠态来实现更安全的密钥分发。当前工作讨论了非最大性对安全密钥分发的影响。它建立了非最大性条件的下界,低于该下界时无法提取出安全密钥。BBM92协议对于密钥分发将更为有利,因为我们发现,在给定设置下,Bell-CHSH不等式的违背程度与量子比特误码率之间存在线性关系。

英文摘要:

Satellite-based quantum communication for secure key distribution is becoming a more demanding field of research due to its unbreakable security. Prepare and measure protocols such as BB84 consider the satellite as a trusted device, fraught with danger looking at the current trend for satellite-based optical communication. Therefore, entanglement-based protocols must be preferred since, along with overcoming the distance limitation, one can consider the satellite as an untrusted device too. E91 protocol is a good candidate for satellite-based quantum communication; but the key rate is low as most of the measured qubits are utilized to verify a Bell-CHSH inequality to ensure security against Eve. An entanglement-based protocol requires a maximally entangled state for more secure key distribution. The current work discusses the effect of non-maximality on secure key distribution. It establishes a lower bound on the non-maximality condition below which no secure key can be extracted. BBM92 protocol will be more beneficial for key distribution as we found a linear connection between the extent of violation for Bell-CHSH inequality and the quantum bit error rate for a given setup.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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