Entanglement Distillation using the Exchange Interaction
arXiv:1508.00364 · doi:10.1007/s00340-015-6286-7
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.
8 pages, 5 figures, v2: corrected typo in Eq. (7)
References in corpus (6)
- The Quantum Internet
- Coherent control of a single electron spin with electric fields
- Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
- Scalable quantum register based on coupled electron spins in a room temperature solid
- Prospects for Spin-Based Quantum Computing
- Entanglement purification without controlled-NOT gates by using the natural dynamics of spin chains