Quantum measurement in the charge representation

Details Quantum measurement in the charge representation Quantum measurement in the charge representation

2004-01-16

arxiv.org/abs/cond-mat/0401286v2

Phys. Rev. B 70, 115327 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.115327

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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