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  • We propose a linear-optical scheme for an efficient amplification of a photonic qubit based on interaction of the signal mode with a pair of entangled ancillae. In contrast to a previous proposal for qubit amplifier by Gisin et al. [Phys Rev. Lett. 105, 070501 (2010)], the success probability of our device does not decrease asymptotically to zero with increasing gain. Moreover, we show how the device can be used to restore entanglement deteriorated by transmission over a lossy channel and calculate the secure key rate for device-independent quantum key distribution.
  • We propose a linear-optical scheme for an efficient amplification of a photonic qubit based on interaction of the signal mode with a pair of entangled ancillae. In contrast to a previous proposal for qubit amplifier by Gisin et al. [Phys Rev. Lett. 105, 070501 (2010)], the success probability of our device does not decrease asymptotically to zero with increasing gain. Moreover, we show how the device can be used to restore entanglement deteriorated by transmission over a lossy channel and calculate the secure key rate for device-independent quantum key distribution. (en)
Title
  • Entanglement-based linear-optical qubit amplifier
  • Entanglement-based linear-optical qubit amplifier (en)
skos:prefLabel
  • Entanglement-based linear-optical qubit amplifier
  • Entanglement-based linear-optical qubit amplifier (en)
skos:notation
  • RIV/68378271:_____/13:00424180!RIV14-GA0-68378271
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  • I, P(ED2.1.00/03.0058), P(EE2.3.30.0041), P(GAP205/12/0382), P(GP13-31000P), S
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  • 1
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  • 72982
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  • RIV/68378271:_____/13:00424180
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  • quantum physics; photonics qubits; qubit amplifier (en)
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  • US - Spojené státy americké
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  • [3CB3777A0F69]
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  • Physical Review. A
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  • 87
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  • Lemr, Karel
  • Soubusta, Jan
  • Černoch, Antonín
  • Bartkiewicz, K.
  • Bula, M.
  • Jennewein, T.
  • Meyer-Scott, E.
http://linked.open...ain/vavai/riv/wos
  • 000322527600003
issn
  • 1050-2947
number of pages
http://bibframe.org/vocab/doi
  • 10.1103/PhysRevA.88.012327
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