Measurement device independent quantum key distribution assisted by hybrid qubit

作者：Dong, Chen^*; Zhao, Shang-Hong; Shang TongFei

来源：Journal of Modern Optics, 2016, 63(21): 2326-2331.

DOI：10.1080/09500340.2016.1200681

• Parallel measurement device independent quantum key distribution
• hybrid qubit
• near-deterministic bell state measurement

Measurement device independent Quantum Key Distribution (MDI-QKD), is immune to all attacks on detection and achieve immense improvement with respect to quantum key distribution system security. However, Bell state measurement (BSM), the kernel processing in MDI-QKD, can only identify two of the four Bell states, which limits the efficiency of the protocol. In this paper, a modified MDI-QKD with hybrid qubit is proposed to provide a major step towards answering this question. The hybrid qubits, which are composed of single photon qubit qubits and coherent qubit, are sent to the quantum relay to perform parallel BSMs synchronously and bit flip can be easily operated to complete the whole key distribution process. The secure key rate can be improved with our modified protocol owing to the higher success probability of BSM, which is increased by adding the parity check of coherent qubit. Furthermore, though our protocol requires photon number resolving detectors, the BSM of coherent state could be instead implemented using squeezed state which makes our scheme practical with state-of-the-art devices.

• 出版日期2016
• 单位中国人民解放军空军工程大学; 中国人民解放军国防科学技术大学