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arXiv:1605.09481

The effective protection protocol of single photon state from photon loss and decoherence

Lan Zhou, Yu‐Bo Sheng

Published May 31, 2016• 0 citations
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Abstract

We design an effect protocol for protecting the single-photon entanglement from photon loss and decoherence. The protocol only requires some auxiliary single photons and the linear optical elements. By operating the protocol, the photon loss can be effectively decreased and the less entangled single photon state can be recovered to the maximally entangled state with some probability. Moreover, the polarization information encoded in the single photon state can be perfectly contained. The protocol can be realized under current experimental condition. As the single photon entanglement is quite important in quantum communication, this protocol may be useful in current and future quantum information processing.

DOI
10.48550/arxiv.1605.09481

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Photon loss is one of the main obstacles in long-distance quantum communication. In this letter, we put forward a highly efficient recyclable amplification protocol for protecting the single-photon entangled state. Different from all of the existing amplification protocols, by repeating the protocol, the discarded items can be reused to increase the success probability and the distilled new mixed state can be further amplified in a next round to increase its fidelity. In particular, this protocol is quite useful under high photon loss conditions. These features make our amplification protocol useful in future long-distance quantum communications.
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Single-photon entanglement (SPE) is an important source in quantum communication. In this paper, we put forward a single-photon-assisted noiseless linear amplification protocol to protect the SPE of an arbitrary polarization–time-bin qudit from the photon transmission loss caused by the practical channel noise. After the amplification, the fidelity of the SPE can be effectively increased. Meanwhile, the encoded polarization–time-bin features of the qudit can be well preserved. The protocol can be realized under the current experimental conditions. Moreover, the amplification protocol can be extended to resist complete photon loss and partial photon loss during the photon transmission. After the amplification, we can not only increase the fidelity of the target state, but also solve the decoherence problem simultaneously. Based on the above features, our amplification protocol may be useful in future quantum communication.