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Efficient sharing of a continuous-variable quantum secret

Tomas Tyc1,2, David J Rowe1,3 and Barry C Sanders1

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We propose an efficient scheme for sharing a continuous-variable quantum secret using passive optical interferometry and squeezers: this efficiency is achieved by showing that a maximum of two squeezers is required to extract the secret state, and we obtain the cheapest configuration in terms of total squeezing cost. Squeezing is a cost for the dealer of the secret as well as for the receivers, and we quantify limitations to the fidelity of the extracted secret state in terms of the squeezing employed by the dealer.


PACS

42.50.Dv Quantum state engineering and measurements

03.67.Hk Quantum communication

03.67.Pp Quantum error correction and other methods for protection against decoherence

03.67.Dd Quantum cryptography and communication security

MSC

81V80 Quantum optics

81R30 Coherent states (See also 22E45); squeezed states (See also 81V80)

81P68 Quantum computation and quantum cryptography (See also 68Q05, 94A60)

Subjects

Computational physics

Optics, quantum optics and lasers

Quantum information and quantum mechanics

Dates

Issue 27 (11 July 2003)

Received 15 January 2003, in final form 7 May 2003

Published 25 June 2003



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