Quantum measurement in charge representation

被引：25

作者：

Rammer, J ^{[1
]}

Shelankov, AL

Wabnig, J

机构：

[1] Umea Univ, Dept Phys, SE-90187 Umea, Sweden

[2] AF Ioffe Phys Tech Inst, St Petersburg 19021, Russia

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.70.115327

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Counting statistics of charge transfers in a point contact interacting with an arbitrary quantum system is studied. The theory for the charge specific density matrix is developed, allowing the evaluation of the probability of the outcome of any joint measurement of the state of the quantum system and the transferred charge. Applying the method of charge projectors, the master equation for the charge specific density matrix is derived in the tunneling Hamiltonian model of the point contact. As an example, the theory is applied to a quantum measurement of a two-state system: The evolution of the charge specific density matrix in the presence of Nyquist or Schottky noise is studied and the conditions for the realization of a projective measurement are established.

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页码：115327 / 1

页数：14

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