Entanglement distillation using the exchange interaction

2015/08/31 by Adrian Auer, René Schwonnek, Christian Schoder +3
Computer Science · Physics and Astronomy · #Distillation #Entanglement distillation #Fidelity #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum optics #Qubit #Set (abstract data type) #Squashed entanglement #quant-ph

paper · pdf · doi:10.1007/s00340-015-6286-7

published as Applied Physics B 122(3), 51 (2016) · 8 pages, 5 figures, v2: corrected typo in Eq. (7)

openalex publication_date 2016/03/01 · openalex created_date 2016/06/24 · arxiv created 2016/09/26 · arxiv updated 2016/09/27 · openalex updated_date 2026/08/05

Abstract

A key ingredient of quantum repeaters is entanglement distillation, i.e., the generation of high-fidelity entangled qubits from a larger set of pairs with lower fidelity. Here, we present entanglement distillation protocols based on qubit couplings that originate from exchange interaction. First, we make use of asymmetric bilateral two-qubit operations generated from anisotropic exchange interaction and show how to distill entanglement using two input pairs. We furthermore consider the case of three input pairs coupled through isotropic exchange. Here, we characterize a set of protocols which are optimizing the tradeoff between the fidelity increase and the probability of a successful run.

Citations

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