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arXiv:1605.09480

The heralded amplification for the single-photon entanglement of the time-bin qubit

Lan Zhou, Yu‐Bo Sheng

Published May 31, 2016• 0 citations
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Abstract

We put forward an effective amplification protocol for protecting the single-photon entangled state of the time-bin qubit. The protocol only requires one pair of the single-photon entangled state and some auxiliary single photons. With the help of the 50:50 beam splitters, variable beam splitters with the transmission of $t$ and the polarizing beam splitters, we can increase the fidelity of the single-photon entangled state under $t

DOI
10.48550/arxiv.1605.09480

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We put forward an effective amplification protocol for protecting the single-photon entangled state of the time-bin qubit. The protocol only requires one pair of the single-photon entangled state and some auxiliary single photons. With the help of the 50:50 beam splitters, variable beam splitters with the transmission of ttt and the polarizing beam splitters, we can increase the fidelity of the single-photon entangled state under $t
We put forward an effective amplification protocol for protecting the single-photon multi-mode W state of the time-bin qubit. The protocol only relies on linear optical elements, such as the 50:5050:5050:50 beam splitters, variable beam splitters with the transmission of ttt and the polarizing beam splitters. Only one pair of the single-photon multi-mode W state and some auxiliary single photons are required, and the fidelity of the single-photon multi-mode W state can be increased under $t
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.
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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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