Tomas Tyc et al 2003 J. Phys. A: Math. Gen. 36 7625 doi:10.1088/0305-4470/36/27/314
Tomas Tyc1,2, David J Rowe1,3 and Barry C Sanders1
Show affiliationsWe 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.
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
81R30 Coherent states (See also 22E45); squeezed states (See also 81V80)
81P68 Quantum computation and quantum cryptography (See also 68Q05, 94A60)
Issue 27 (11 July 2003)
Received 15 January 2003, in final form 7 May 2003
Published 25 June 2003
Tomas Tyc et al 2003 J. Phys. A: Math. Gen. 36 7625
M Drakopoulos et al 2003 J. Phys. D: Appl. Phys. 36 A214
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