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Quantum Instabilities and Decoherence Problem

100%

Kilin S., Horoshko D., Shatokhin V.

Acta Physica Polonica A

1998

vol. 93

issue 1

97-104

A decoherence problem is discussed by means of quantum continuous measurement theory. It is shown that the conditional state of quantum system interacting with a bath preserves its initial purity. In this presentation decoherence arises as a result of averaging over the stochastic times of reduction moments ("clicks"). A method based on external phase feedback is proposed to slow down the decoherence of field superposition state in an open optical cavity. It is also shown that an atom placed inside the optical cavity plays a role of internal self-organized positive feedback between field and atom, which leads to an exponential increase in the mean dipole moment of the atom for the field initially prepared in a superposition of coherent states, i.e. to quantum instability.

Fluorescence Correlation and Low Temperature Linewidth of Single Defect Centers in Diamond

76%

Dräbenstedt A., Tietz C., Jelezko F., Wrachtrup J., Kilin S., Nizovtzev A.

vol. 96

issue 5

665-675

Low temperature fluorescence excitation spectroscopy was carried out on single nitrogen vacancy defect centers. At temperatures below 90 K the fluorescence intensity of individual centers drastically diminishes because of the population of a metastable singlet state in near resonance with the optically excited state. Low temperature fluorescence excitation spectroscopy down to 5 K becomes possible via deshelving of this state with a second laser source. Surprisingly individual centers reveal low temperature fluorescence excitation line widths around 0.6 meV.

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2 Acta Physica Polonica A

1 1999

1 1998

2 Kilin S.

1 Dräbenstedt A.

1 Horoshko D.

1 Jelezko F.

1 Nizovtzev A.

1 Shatokhin V.

1 Tietz C.

1 Wrachtrup J.

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Quantum Instabilities and Decoherence Problem

Fluorescence Correlation and Low Temperature Linewidth of Single Defect Centers in Diamond