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Measuring irreversible dynamics of a quantum harmonic oscillator

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Morigi,  Giovanna
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Solano,  Enrique
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Englert,  Berthold-Georg
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Walther,  Herbert
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Citation

Morigi, G., Solano, E., Englert, B.-G., & Walther, H. (2002). Measuring irreversible dynamics of a quantum harmonic oscillator. Physical Review A, 65(4): 040102. 040102. Retrieved from http://link.aps.org/abstract/PRA/v65/e040102.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-C22F-5
Abstract
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 time 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 multipath interferometry.