dorsal/arxiv
View SchemaFault-tolerant quantum repeaters with minimal physical resources, and implementations based on single photon emitters
| Authors | L. I. Childress, J. M. Taylor, A. S. Sorensen, M. D. Lukin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0502112 |
| URL | https://arxiv.org/abs/quant-ph/0502112 |
| DOI | 10.1103/PhysRevA.72.052330 |
Abstract
We analyze a novel method that uses fixed, minimal physical resources to achieve generation and nested purification of quantum entanglement for quantum communication over arbitrarily long distances, and discuss its implementation using realistic photon emitters and photonic channels. In this method, we use single photon emitters with two internal degrees of freedom formed by an electron spin and a nuclear spin to build intermediate nodes in a quantum channel. State-selective fluorescence is used for probabilistic entanglement generation between electron spins in adjacent nodes. We analyze in detail several approaches which are applicable to realistic, homogeneously broadened single photon emitters. Furthermore, the coupled electron and nuclear spins can be used to efficiently implement entanglement swapping and purification. We show that these techniques can be combined to generate high-fidelity entanglement over arbitrarily long distances. We present a specific protocol that functions in polynomial time and tolerates percent-level errors in entanglement fidelity and local operations. The scheme has the lowest requirements on physical resources of any current scheme for fully fault-tolerant quantum repeaters.
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"abstract": "We analyze a novel method that uses fixed, minimal physical resources to\nachieve generation and nested purification of quantum entanglement for quantum\ncommunication over arbitrarily long distances, and discuss its implementation\nusing realistic photon emitters and photonic channels. In this method, we use\nsingle photon emitters with two internal degrees of freedom formed by an\nelectron spin and a nuclear spin to build intermediate nodes in a quantum\nchannel. State-selective fluorescence is used for probabilistic entanglement\ngeneration between electron spins in adjacent nodes. We analyze in detail\nseveral approaches which are applicable to realistic, homogeneously broadened\nsingle photon emitters. Furthermore, the coupled electron and nuclear spins can\nbe used to efficiently implement entanglement swapping and purification. We\nshow that these techniques can be combined to generate high-fidelity\nentanglement over arbitrarily long distances. We present a specific protocol\nthat functions in polynomial time and tolerates percent-level errors in\nentanglement fidelity and local operations. The scheme has the lowest\nrequirements on physical resources of any current scheme for fully\nfault-tolerant quantum repeaters.",
"arxiv_id": "quant-ph/0502112",
"authors": [
"L. I. Childress",
"J. M. Taylor",
"A. S. Sorensen",
"M. D. Lukin"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.72.052330",
"title": "Fault-tolerant quantum repeaters with minimal physical resources, and implementations based on single photon emitters",
"url": "https://arxiv.org/abs/quant-ph/0502112"
},
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