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arXiv 2004.118772020-04-24quant-ph

Stable, low-error and calibration-free polarization encoder for free-space quantum communication

Marco Avesani, Costantino Agnesi, Andrea Stanco, Giuseppe Vallone, Paolo Villoresi

备注：: 6 pages, 2 figures
发表信息：: Optics Letters Vol. 45, Issue 17, pp. 4706-4709 (2020)
DOI：: 10.1364/OL.396412

英文摘要：

Polarization-encoded free-space Quantum Communication requires a quantum state source featuring fast polarization modulation, long-term stability and a low intrinsic error rate. Here we present a source based on a Sagnac interferometer and composed of polarization maintaining fibers, a fiber polarization beam splitter and an electro-optic phase modulator. The system generates predetermined polarization states with a fixed reference frame in free-space that does not require calibration neither at the transmitter nor at the receiver. In this way we achieve long-term stability and low error rates. A proof-of-concept experiment is also reported, demonstrating a Quantum Bit Error Rate lower than 0.2% for several hours without any active recalibration of the devices.

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