dorsal/arxiv
View SchemaHybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent light
| Authors | Thaddeus D. Ladd, Peter van Loock, Kae Nemoto, William J. Munro, Yoshihisa Yamamoto |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0610154 |
| URL | https://arxiv.org/abs/quant-ph/0610154 |
| DOI | 10.1088/1367-2630/8/9/184 |
| Journal | New J. Phys. 8, 164 (2006) |
Abstract
We describe a system for long-distance distribution of quantum entanglement, in which coherent light with large average photon number interacts dispersively with single, far-detuned atoms or semiconductor impurities in optical cavities. Entanglement is heralded by homodyne detection using a second bright light pulse for phase reference. The use of bright pulses leads to a high success probability for the generation of entanglement, at the cost of a lower initial fidelity. This fidelity may be boosted by entanglement purification techniques, implemented with the same physical resources. The need for more purification steps is well compensated for by the increased probability of success when compared to heralded entanglement schemes using single photons or weak coherent pulses with realistic detectors. The principle cause of the lower initial fidelity is fiber loss; however, spontaneous decay and cavity losses during the dispersive atom/cavity interactions can also impair performance. We show that these effects may be minimized for emitter-cavity systems in the weak-coupling regime as long as the resonant Purcell factor is larger than one, the cavity is over-coupled, and the optical pulses are sufficiently long. We support this claim with numerical, semiclassical calculations using parameters for three realistic systems: optically bright donor-bound impurities such as 19-F:ZnSe with a moderate-Q microcavity, the optically dim 31-P:Si system with a high-Q microcavity, and trapped ions in large but very high-Q cavities.
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"abstract": "We describe a system for long-distance distribution of quantum entanglement,\nin which coherent light with large average photon number interacts dispersively\nwith single, far-detuned atoms or semiconductor impurities in optical cavities.\nEntanglement is heralded by homodyne detection using a second bright light\npulse for phase reference. The use of bright pulses leads to a high success\nprobability for the generation of entanglement, at the cost of a lower initial\nfidelity. This fidelity may be boosted by entanglement purification techniques,\nimplemented with the same physical resources. The need for more purification\nsteps is well compensated for by the increased probability of success when\ncompared to heralded entanglement schemes using single photons or weak coherent\npulses with realistic detectors. The principle cause of the lower initial\nfidelity is fiber loss; however, spontaneous decay and cavity losses during the\ndispersive atom/cavity interactions can also impair performance. We show that\nthese effects may be minimized for emitter-cavity systems in the weak-coupling\nregime as long as the resonant Purcell factor is larger than one, the cavity is\nover-coupled, and the optical pulses are sufficiently long. We support this\nclaim with numerical, semiclassical calculations using parameters for three\nrealistic systems: optically bright donor-bound impurities such as 19-F:ZnSe\nwith a moderate-Q microcavity, the optically dim 31-P:Si system with a high-Q\nmicrocavity, and trapped ions in large but very high-Q cavities.",
"arxiv_id": "quant-ph/0610154",
"authors": [
"Thaddeus D. Ladd",
"Peter van Loock",
"Kae Nemoto",
"William J. Munro",
"Yoshihisa Yamamoto"
],
"categories": [
"quant-ph"
],
"doi": "10.1088/1367-2630/8/9/184",
"journal_ref": "New J. Phys. 8, 164 (2006)",
"title": "Hybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent light",
"url": "https://arxiv.org/abs/quant-ph/0610154"
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