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ACTA PHOTONICA SINICA

Differential Phase Encoding Scheme for the Polarization State of Quantum Signaling and Simulation

曹亚梅 曹亚梅, 聂敏 聂敏, 刘晓慧 刘晓慧

Published Jan 1, 2013• 0 citations
Publisher
DOI
10.3788/gzxb20134206.0721

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In order to study the quantum communication signaling system and realize quantum communication between multiple users,a kind of differential phase encoding scheme for the polarization state of quantum signaling is proposed,and details of the encoding process are described.The sender uses polarization states of different photons to represent different signalings,and then implements phase modulation for the photons and encodes the quantum signaling based on the phase difference between the impulses before and affter encoding.In order to complete the decoding,two optical pulses occur interference at the beam splitter.The signal 0 or 1 can be detected by different detectors according to their phase difference.According to the Gaussian pulse distribution,quantitative relationship amongthe quantum bit error rate caused by the pulse delay to differential phase of encoding system,pulse width and delay time in photonic transmission process are enduced.Besides,quantum bit error rate of single-photon pulsesdistribution of Gaussian is calculated in determined timing jitter.Finally,quantum signaling encoded efficiency and bit error rate are analyzed and simulated.The results show that the encoded efficiency of proposed coding scheme can reach 75% that can satisfy the needs of quantum mobile communication.
The polarization-division multiplexing (PDM) technology is a practical method to double the transmission capacity, and the corresponding phase regeneration (PR) for PDM signals is meaningful and necessary to extend the transmission distance and increase the transparency for the phase-encoded PDM system. Those reported PDM PR schemes either utilized polarization-diversity technique or required special PDM format. In order to overcome these issues, the PR for the PDM phase-modulated signals is proposed and theoretically demonstrated in this paper, based on the vector dual-pump nondegenerate phase sensitive amplification (PSA). The theoretical model is established and the detailed characteristics are investigated to optimize the PR performance. Results show an obvious phase squeezing for the degraded 80 Gbit/s PDM differential phase-shift keying (DPSK) signals, and the error vector magnitude (EVM) of the regenerated signals on dual polarization states can be improved from 22.58% and 21.39% to 4.57% and 4.63%, respectively. Furthermore, the applicability of the proposed scheme for PDM quaternary-phase shift keying (QPSK) signals is investigated. The proposed scheme can be useful and promising in current PDM based coherent fiber-optic communication.
This paper proposes a measurement-device-independent quantum key distribution (MDI-QKD) scheme based on differential phase encoding. The differential phase shift MDI-QKD (DPS-MDI-QKD) couples the advantages of DPS-QKD with that of MDI-QKD. The proposed scheme offers resistance against photon number splitting attack and phase fluctuations as well as immunity against detector side-channel vulnerabilities. The design proposed in this paper uses weak coherent pulses in a superposition of three orthogonal states, corresponding to one of three distinct paths in a delay-line interferometer. The classical bit information is encoded in the phase difference between pulses traversing successive paths. This 3-pulse superposition offers enhanced security compared to using a train of pulses by decreasing the learning rate of an eavesdropper and unmasking her presence with an increased error rate upon application of intercept and resend attack and beamsplitter attack. The proposed scheme employs phase locking of the sources of the two trusted parties so as to maintain the coherence between their optical signal, and uses a beamsplitter (BS) at the untrusted node (Charlie) to extract the key information from the phase encoded signals.