dorsal/arxiv
View SchemaExperimental demonstration of quantum memory for light
| Authors | Brian Julsgaard, Jacob Sherson, J. Ignacio Cirac, Jaromir Fiurasek, Eugene S. Polzik |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0410072 |
| URL | https://arxiv.org/abs/quant-ph/0410072 |
| DOI | 10.1038/nature03064 |
| Journal | Nature 432, 482 - 486 (25 November 2004) |
Abstract
The information carrier of today's communications, a weak pulse of light, is an intrinsically quantum object. As a consequence, complete information about the pulse cannot, even in principle, be perfectly recorded in a classical memory. In the field of quantum information this has led to a long standing challenge: how to achieve a high-fidelity transfer of an independently prepared quantum state of light onto the atomic quantum state? Here we propose and experimentally demonstrate a protocol for such quantum memory based on atomic ensembles. We demonstrate for the first time a recording of an externally provided quantum state of light onto the atomic quantum memory with a fidelity up to 70%, significantly higher than that for the classical recording. Quantum storage of light is achieved in three steps: an interaction of light with atoms, the subsequent measurement on the transmitted light, and the feedback onto the atoms conditioned on the measurement result. Density of recorded states 33% higher than that for the best classical recording of light on atoms is achieved. A quantum memory lifetime of up to 4 msec is demonstrated.
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"abstract": "The information carrier of today\u0027s communications, a weak pulse of light, is\nan intrinsically quantum object. As a consequence, complete information about\nthe pulse cannot, even in principle, be perfectly recorded in a classical\nmemory. In the field of quantum information this has led to a long standing\nchallenge: how to achieve a high-fidelity transfer of an independently prepared\nquantum state of light onto the atomic quantum state? Here we propose and\nexperimentally demonstrate a protocol for such quantum memory based on atomic\nensembles. We demonstrate for the first time a recording of an externally\nprovided quantum state of light onto the atomic quantum memory with a fidelity\nup to 70%, significantly higher than that for the classical recording. Quantum\nstorage of light is achieved in three steps: an interaction of light with\natoms, the subsequent measurement on the transmitted light, and the feedback\nonto the atoms conditioned on the measurement result. Density of recorded\nstates 33% higher than that for the best classical recording of light on atoms\nis achieved. A quantum memory lifetime of up to 4 msec is demonstrated.",
"arxiv_id": "quant-ph/0410072",
"authors": [
"Brian Julsgaard",
"Jacob Sherson",
"J. Ignacio Cirac",
"Jaromir Fiurasek",
"Eugene S. Polzik"
],
"categories": [
"quant-ph"
],
"doi": "10.1038/nature03064",
"journal_ref": "Nature 432, 482 - 486 (25 November 2004)",
"title": "Experimental demonstration of quantum memory for light",
"url": "https://arxiv.org/abs/quant-ph/0410072"
},
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