Quantum secure direct communication of digital and analog signals using continuum coherent states

Guerra, Antônio Geovan de Araújo Holanda; Rios, Francisco Franklin Sousa; Ramos, Rubens Viana

doi:10.1007/s11128-016-1410-0

Cited by 22 publications

(1 citation statement)

References 12 publications

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“…In the past few decades, entanglement has been widely used in quantum teleportation, [1][2][3][4] quantum secure direct communication, [5][6][7][8][9][10][11][12] quantum key distribution, [13][14][15][16] and so on. [17][18][19][20][21][22][23][24] Among the various entanglement forms, single-photon entanglement (SPE) with the form of (|1 A 0 B + |0 A 1 B )/ √ 2 (A and B are two distant locations) is the simplest but most important entanglement mode. SPE has important applications in cryptography [25,26] and quantum repeater protocols.…”

Section: Introductionmentioning

confidence: 99%

Noiseless linear amplification for the single-photon entanglement of arbitrary polarization–time-bin qudit

Chen¹,

Sheng²,

Zhou³

2019

Chinese Phys. B

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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.

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