2016/04/26 by Denis Gonţa, Peter van Loock · 6 citations
Computer Science · Engineering · Physics and Astronomy · #Beam splitter #Coherent states #Computer science #Electrical engineering #Encoding (memory) #Engineering #Laser #Neural Networks and Reservoir Computing #Physics #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Quantum teleportation #Qubit #Repeater (horology) #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1007/s00340-016-6388-x
published in Applied Physics B 122(5) (Springer Science+Business Media) · 22 pages, 5 figures. version accepted in Applied Physics B (topical collection: Quantum Repeaters - From Components to Strategies). arXiv admin note: text overlap with arXiv:1309.1668
openalex publication_date 2016/04/26 · arxiv created 2016/09/13 · arxiv updated 2016/09/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the framework of cavity QED, we propose a quantum repeater scheme that uses coherent light and chains of atoms coupled to optical cavities. In contrast to conventional repeater schemes, we avoid the usage of two-qubit quantum logical gates by exploiting solely the cavity QED evolution. In our previous paper [D. Gonta and P. van Loock: Phys. Rev. A 88, 052308 (2013)], we already proposed a quantum repeater in which the entanglement between two neighboring repeater nodes was distributed using controlled displacements of input coherent light, while the produced low-fidelity entangled pairs were purified using ancillary (four-partite) entangled states. In this paper, the entanglement distribution is realized using a sequence of controlled phase shifts and displacements of input coherent light. Compared to previous coherent-state-based distribution schemes for two-qubit entanglement, the present scheme relies only upon a simple discrimination of two coherent states with opposite signs, which can be performed in a quantum mechanically optimal fashion via a beam splitter and two on-off detectors. The entanglement purification utilizes a scheme that avoids the usage of ancillary entangled resources. Our repeater scheme exhibits reasonable fidelities and repeater rates providing an attractive platform for long-distance quantum communication.