Quantum cryptography using balanced homodyne detection

Details Quantum cryptography using balanced homodyne detection Quantum cryptography using balanced homodyne detection

2000-08-08

arxiv.org/abs/quant-ph/0008037v2

Phys. Rev. A 68, 042331 (2003)

Physics

Quantum Physics

Errors in the sentence citing ref.[20] are corrected

Scientific paper

10.1103/PhysRevA.68.042331

We report an experimental quantum key distribution that utilizes balanced homodyne detection, instead of photon counting, to detect weak pulses of coherent light. Although our scheme inherently has a finite error rate, it allows high-efficiency detection and quantum state measurement of the transmitted light using only conventional devices at room temperature. When the average photon number was 0.1, an error rate of 0.08 and "effective" quantum efficiency of 0.76 were obtained.

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