The security analysis of E91 protocol in collective-rotation noise channel

Abstract

The bit error in quantum communication is mainly caused by eavesdropping and noise. However, most quantum communication protocols only take eavesdropping into consideration and ignore the result of noise, making the inaccuracy situations in detecting the eavesdropper. To analyze the security of the quantum E91 protocol presented by Ekert in collective-rotation noise channel, an excellent model of noise analysis is proposed. The increment of the qubits error rate (ber) is used to detect eavesdropping. In our analysis, eavesdropper (Eve) can maximally get about 50% of the key from the communication when the noise level approximates to 0.5. The results show that in the collective-rotation noise environment, E91 protocol is secure and the raw key is available just as we have knew and proved. We also presented a new idea in analyzing the protocol security in noise channel.

A flexible continuous-wave quantum cryptography scheme with zero-trust security for Internet of Things

“…Unlike the protocols based on non-classical states, such as single photons 22 and entangled states, 33,34 Grangier’s group proposed a protocol where only optical coherent states are required. 28 In this protocol, Alice modulates the amplitude and phase of the laser field to generate a coherent state | α A 〉 , where α A = X A + i P A .…”