Secure quantum key distribution using squeezed states
We prove the security of a quantum key distribution scheme based on transmission of squeezed quantum states of a harmonic oscillator. Our proof employs quantum error-correcting codes that encode a finite-dimensional quantum system in the infinite-dimensional Hilbert space of an oscillator, and protect against errors that shift the canonical variables p and q. If the noise in the quantum channel is weak, squeezing signal states by 2.51 dB (a squeeze factor e{sup r}=1.34) is sufficient in principle to ensure the security of a protocol that is suitably enhanced by classical error correction and privacy amplification. Secure key distribution can be achieved over distances comparable to the attenuation length of the quantum channel.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40206020
- Journal Information:
- Physical Review A, Vol. 63, Issue 2; Other Information: DOI: 10.1103/PhysRevA.63.022309; Othernumber: PLRAAN000063000002022309000001; 100101PRA; PBD: Feb 2001; ISSN 1050-2947
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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