Evolution of Number State to Density Operator of Binomial Distribution in the Amplitude Dissipative Channel

doi:10.1088/0256-307X/27/5/050302

Chin. Phys. Lett.

2010, Vol. 27

Issue (5): 050302 DOI: 10.1088/0256-307X/27/5/050302

GENERAL

Evolution of Number State to Density Operator of Binomial Distribution in the Amplitude Dissipative Channel

FAN Hong-Yi^1,2; REN Gang¹

¹Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026 ²Department of Physics, Shanghai Jiao Tong University, Shanghai 200030

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FAN Hong-Yi, REN Gang 2010 Chin. Phys. Lett. 27 050302

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Abstract We show that passing through the amplitude dissipative channel the initial pure number state density operator is evolved into the density operator of binomial distribution (a mixed state), and the binomial distribution parameter is just equal to e^-2kt,where κ is the dissipative parameter of the channel. We solve the corresponding master equation to obtain the operator-sum representation of the density operator by virtue of the entangled state representation, which seems to be a convenient approach.

Keywords: 03.65.-w 02.90.+p

Received: 02 February 2010 Published: 23 April 2010

PACS:	03.65.-w	(Quantum mechanics)
	02.90.+p	(Other topics in mathematical methods in physics)

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	FAN Hong-Yi
	REN Gang

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