Measuring irreversible dynamics of a quantum harmonic oscillator

Details Measuring irreversible dynamics of a quantum harmonic oscillator Measuring irreversible dynamics of a quantum harmonic oscillator

2001-08-17

arxiv.org/abs/quant-ph/0108082v1

Physical Review A, vol. 65, 2002, art. no. 040102(R) (4 pages)

Physics

Quantum Physics

4 pages, 2 figures; submitted to Physical Review A as a Rapid Communication

Scientific paper

10.1103/PhysRevA.65.040102

We show that the unitary evolution of a harmonic oscillator coupled to a two-level system can be undone by a suitable manipulation of the two-level system -- more specifically: by a quasi-instantaneous phase change. This enables us to isolate the dissipative evolution to which the oscillator may be exposed in addition. With this method we study the decoherence of a photon mode in cavity QED, and that of the quantized harmonic motion of trapped ions. We comment on the relation to spin echoes and multi-path interferometry.

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