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Entanglement-based linear-optical qubit amplifier
- 1.0424180 - FZÚ 2014 RIV US eng J - Journal Article
Meyer-Scott, E. - Bula, M. - Bartkiewicz, K. - Černoch, Antonín - Soubusta, Jan - Jennewein, T. - Lemr, Karel
Entanglement-based linear-optical qubit amplifier.
Physical Review. A. Roč. 87, č. 1 (2013), "012327-1"-"012327-7". ISSN 1050-2947
R&D Projects: GA ČR GAP205/12/0382
Institutional support: RVO:68378271
Keywords : quantum physics * photonics qubits * qubit amplifier
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.991, year: 2013
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.
Permanent Link: http://hdl.handle.net/11104/0230199
Number of the records: 1