2016/07/25 by Rikizo Ikuta, Shota Nozaki, Takashi Yamamoto +2
Computer Science · Mathematics · Physics and Astronomy · #Mathematics #Photon #Photon entanglement #Photonics #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum decoherence #Quantum entanglement #Quantum key distribution #Quantum mechanics #Quantum optics and atomic interactions #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1038/s41598-017-05008-6
published as Scientific Reports 7, 4819 (2017) · 5 pages, 6 figures
arxiv created 2016/07/25 · openalex publication_date 2017/06/30 · arxiv updated 2017/10/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Embedding a quantum state in a decoherence-free subspace (DFS) formed by multiple photons is one of the promising methods for robust entanglement distribution of photonic states over collective noisy channels. In practice, however, such a scheme suffers from a low efficiency proportional to transmittance of the channel to the power of the number of photons forming the DFS. The use of a counter-propagating coherent pulse can improve the efficiency to scale linearly in the channel transmission, but it achieves only protection against phase noises. Recently, it was theoretically proposed [Phys. Rev. A 87, 052325(2013)] that the protection against bit-flip noises can also be achieved if the channel has a reciprocal property. Here we experimentally demonstrate the proposed scheme to distribute polarization-entangled photon pairs against a general collective noise including the bit flip noise and the phase noise. We observed an efficient sharing rate scaling while keeping a high quality of the distributed entangled state. Furthermore, we show that the method is applicable not only to the entanglement distribution but also to the transmission of arbitrary polarization states of a single photon.