Positive-operator-valued-measure receiver for quantum cryptograp

Details Positive-operator-valued-measure receiver for quantum cryptograp Positive-operator-valued-measure receiver for quantum cryptograp

1997-05-23

1999-12-07

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

380 21, 380 9, H04B 1000, H04K 102, H04L 900

Patent

active

059992859

ABSTRACT:
Quantum key distribution (QKD) employs non-orthogonal quantum states to distribute a random bit sequence between two users for use as a provably secure key for encryption and authentication. The key generation procedure involves the transmission, interception, and reception of two nonorthogonal photon polarization states. At the receiving end, a positive-operator-valued measure (POVM) is employed in the measurement process. The invention is a receiver that is an all-optical realization of the POVM and includes a Wollaston prism, a mirror, two beam splitters, a polarization rotator, and three photodetectors.

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Unambiguous Quantum Measurement of Nonorthogonal States, B. Huttner, A. Mer, J.D. Gautier, H. Zbinden and N. Gisin, The American Physical Society, vol. 54, No. 5, Nov. 1996.
Eavesdropping on Quantum-Cryptographical Systems, Artur K. Ekert, Bruno Huttner, G. Massimo Palma and Asher Peres, vol. 50, No. 2, Aug. 1994.

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