dorsal/arxiv
View SchemaPreparation of decoherence-free, subradiant states in a cavity
| Authors | Peter Foldi, Mihaly G. Benedict, Attila Czirjak |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0106025 |
| URL | https://arxiv.org/abs/quant-ph/0106025 |
| DOI | 10.1103/PhysRevA.65.021802 |
| Journal | Phys. Rev. A 65, 021802(R) (2002). |
Abstract
The cause of decoherence in a quantum system can be traced back to the interaction with the environment. As it has been pointed out first by Dicke, in a system of N two-level atoms where each of the atoms is individually dipole coupled to the environment, there are collective, subradiant states, that have no dipole coupling to photon modes, and therefore they are expected to decay slower. This property also implies that these type of states, which form an N-1 dimensional subspace of the atomic subsytem, also decohere slower. We propose a scheme which will create such states. First the two-level atoms are placed in a strongly detuned cavity and one of the atoms, called the control atom is excited. The time evolution of the coupled atom-cavity system leads to an appropriately entangled state of the atoms. By applying subsequent laser pulses at a well defined time instant, it is possible to drive the atomic state into the subradiant, i. e., decoherence free subspace. Up to a certain average number of the photons, the result is independent of the state of the cavity. The analysis of the conditions shows that this scheme is feasible with present day techniques achieved in atom cavity interaction experiments.
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"abstract": "The cause of decoherence in a quantum system can be traced back to the\ninteraction with the environment. As it has been pointed out first by Dicke, in\na system of N two-level atoms where each of the atoms is individually dipole\ncoupled to the environment, there are collective, subradiant states, that have\nno dipole coupling to photon modes, and therefore they are expected to decay\nslower. This property also implies that these type of states, which form an N-1\ndimensional subspace of the atomic subsytem, also decohere slower. We propose a\nscheme which will create such states. First the two-level atoms are placed in a\nstrongly detuned cavity and one of the atoms, called the control atom is\nexcited. The time evolution of the coupled atom-cavity system leads to an\nappropriately entangled state of the atoms. By applying subsequent laser pulses\nat a well defined time instant, it is possible to drive the atomic state into\nthe subradiant, i. e., decoherence free subspace. Up to a certain average\nnumber of the photons, the result is independent of the state of the cavity.\nThe analysis of the conditions shows that this scheme is feasible with present\nday techniques achieved in atom cavity interaction experiments.",
"arxiv_id": "quant-ph/0106025",
"authors": [
"Peter Foldi",
"Mihaly G. Benedict",
"Attila Czirjak"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.65.021802",
"journal_ref": "Phys. Rev. A 65, 021802(R) (2002).",
"title": "Preparation of decoherence-free, subradiant states in a cavity",
"url": "https://arxiv.org/abs/quant-ph/0106025"
},
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