dorsal/arxiv
View SchemaHow to Measure the Quantum State of Collective Atomic Spin Excitation
| Authors | Koji Usami, Jun-ichi Takahashi, Mikio Kozuma |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0609054 |
| URL | https://arxiv.org/abs/quant-ph/0609054 |
| DOI | 10.1103/PhysRevA.74.043815 |
| Journal | Phys. Rev. A 74, 043815 (2006) |
Abstract
The spin state of an atomic ensemble can be viewed as two bosonic modes, i.e., a quantum signal mode and a $c$-numbered ``local oscillator'' mode when large numbers of spin-1/2 atoms are spin-polarized along a certain axis and collectively manipulated within the vicinity of the axis. We present a concrete procedure which determines the spin-excitation-number distribution, i.e., the diagonal elements of the density matrix in the Dicke basis for the collective spin state. By seeing the collective spin state as a statistical mixture of the inherently-entangled Dicke states, the physical picture of its multi-particle entanglement is made clear.
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"abstract": "The spin state of an atomic ensemble can be viewed as two bosonic modes,\ni.e., a quantum signal mode and a $c$-numbered ``local oscillator\u0027\u0027 mode when\nlarge numbers of spin-1/2 atoms are spin-polarized along a certain axis and\ncollectively manipulated within the vicinity of the axis. We present a concrete\nprocedure which determines the spin-excitation-number distribution, i.e., the\ndiagonal elements of the density matrix in the Dicke basis for the collective\nspin state. By seeing the collective spin state as a statistical mixture of the\ninherently-entangled Dicke states, the physical picture of its multi-particle\nentanglement is made clear.",
"arxiv_id": "quant-ph/0609054",
"authors": [
"Koji Usami",
"Jun-ichi Takahashi",
"Mikio Kozuma"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.74.043815",
"journal_ref": "Phys. Rev. A 74, 043815 (2006)",
"title": "How to Measure the Quantum State of Collective Atomic Spin Excitation",
"url": "https://arxiv.org/abs/quant-ph/0609054"
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