dorsal/arxiv
View SchemaEffects of motion in cavity QED
| Authors | A. C. Doherty, A. S. Parkins, S. M. Tan, D. F. Walls |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9904045 |
| URL | https://arxiv.org/abs/quant-ph/9904045 |
| DOI | 10.1088/1464-4266/1/4/320 |
Abstract
We consider effects of motion in cavity quantum electrodynamics experiments where single cold atoms can now be observed inside the cavity for many Rabi cycles. We discuss the timescales involved in the problem and the need for good control of the atomic motion, particularly the heating due to exchange of excitation between the atom and the cavity, in order to realize nearly unitary dynamics of the internal atomic states and the cavity mode which is required for several schemes of current interest such as quantum computing. Using a simple model we establish ultimate effects of the external atomic degrees of freedom on the action of quantum gates. The perfomance of the gate is characterized by a measure based on the entanglement fidelity and the motional excitation caused by the action of the gate is calculated. We find that schemes which rely on adiabatic passage, and are not therefore critically dependent on laser pulse areas, are very much more robust against interaction with the external degrees of freedom of atoms in the quantum gate.
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"abstract": "We consider effects of motion in cavity quantum electrodynamics experiments\nwhere single cold atoms can now be observed inside the cavity for many Rabi\ncycles. We discuss the timescales involved in the problem and the need for good\ncontrol of the atomic motion, particularly the heating due to exchange of\nexcitation between the atom and the cavity, in order to realize nearly unitary\ndynamics of the internal atomic states and the cavity mode which is required\nfor several schemes of current interest such as quantum computing. Using a\nsimple model we establish ultimate effects of the external atomic degrees of\nfreedom on the action of quantum gates. The perfomance of the gate is\ncharacterized by a measure based on the entanglement fidelity and the motional\nexcitation caused by the action of the gate is calculated. We find that schemes\nwhich rely on adiabatic passage, and are not therefore critically dependent on\nlaser pulse areas, are very much more robust against interaction with the\nexternal degrees of freedom of atoms in the quantum gate.",
"arxiv_id": "quant-ph/9904045",
"authors": [
"A. C. Doherty",
"A. S. Parkins",
"S. M. Tan",
"D. F. Walls"
],
"categories": [
"quant-ph"
],
"doi": "10.1088/1464-4266/1/4/320",
"title": "Effects of motion in cavity QED",
"url": "https://arxiv.org/abs/quant-ph/9904045"
},
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