dorsal/arxiv
View SchemaWigner functions, squeezing properties and slow decoherence of atomic Schrodinger cats
| Authors | M. G. Benedict, A. Czirjak |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9904058 |
| URL | https://arxiv.org/abs/quant-ph/9904058 |
| DOI | 10.1103/PhysRevA.60.4034 |
| Journal | Phys.Rev. A60 (1999) 4034 |
Abstract
We consider a class of states in an ensemble of two-level atoms: a superposition of two distinct atomic coherent states, which can be regarded as atomic analogues of the states usually called Schrodinger cat states in quantum optics. According to the relation of the constituents we define polar and nonpolar cat states. The properties of these are investigated by the aid of the spherical Wigner function. We show that nonpolar cat states generally exhibit squeezing, the measure of which depends on the separation of the components of the cat, and also on the number of the constituent atoms. By solving the master equation for the polar cat state embedded in an external environment, we determine the characteristic times of decoherence, dissipation and also the characteristic time of a new parameter, the non-classicality of the state. This latter one is introduced by the help of the Wigner function, which is used also to visualize the process. The dependence of the characteristic times on the number of atoms of the cat and on the temperature of the environment shows that the decoherence of polar cat states is surprisingly slow.
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"abstract": "We consider a class of states in an ensemble of two-level atoms: a\nsuperposition of two distinct atomic coherent states, which can be regarded as\natomic analogues of the states usually called Schrodinger cat states in quantum\noptics. According to the relation of the constituents we define polar and\nnonpolar cat states. The properties of these are investigated by the aid of the\nspherical Wigner function. We show that nonpolar cat states generally exhibit\nsqueezing, the measure of which depends on the separation of the components of\nthe cat, and also on the number of the constituent atoms. By solving the master\nequation for the polar cat state embedded in an external environment, we\ndetermine the characteristic times of decoherence, dissipation and also the\ncharacteristic time of a new parameter, the non-classicality of the state. This\nlatter one is introduced by the help of the Wigner function, which is used also\nto visualize the process. The dependence of the characteristic times on the\nnumber of atoms of the cat and on the temperature of the environment shows that\nthe decoherence of polar cat states is surprisingly slow.",
"arxiv_id": "quant-ph/9904058",
"authors": [
"M. G. Benedict",
"A. Czirjak"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.60.4034",
"journal_ref": "Phys.Rev. A60 (1999) 4034",
"title": "Wigner functions, squeezing properties and slow decoherence of atomic Schrodinger cats",
"url": "https://arxiv.org/abs/quant-ph/9904058"
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