Proof-of-principle experiment of reference-frame-independent quantum key distribution with phase coding

Abstract

We have demonstrated a proof-of-principle experiment of reference-frame-independent phase coding quantum key distribution (RFI-QKD) over an 80-km optical fiber. After considering the finite-key bound, we still achieve a distance of 50 km. In this scenario, the phases of the basis states are related by a slowly time-varying transformation. Furthermore, we developed and realized a new decoy state method for RFI-QKD systems with weak coherent sources to counteract the photon-number-splitting attack. With the help of a reference-frame-independent protocol and a Michelson interferometer with Faraday rotator mirrors, our system is rendered immune to the slow phase changes of the interferometer and the polarization disturbances of the channel, making the procedure very robust.

arXiv comment19 pages

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• Robustness of reference-frame-independent quantum key distribution against the relative motion of the reference frames
• Experimental comparison of various quantum key distribution protocols under reference frame rotation and fuctuation
• Biased decoy-state reference-frame-independent quantum key distribution
• Perfect tight quantum teleportation without a shared reference frame
• Towards practical high-speed high dimensional quantum key distribution using partial mutual unbiased basis of photon's orbital angular momentum
• Motion-Compensated Handheld Quantum Key Distribution System
• Quantum teleportation with infinite reference frame uncertainty and without prior alignment
• Four-state reference-frame-independent quantum key distribution with non-qubit sources