Quantum control of atomic systems by homodyne detection and feedback
Physical Review A. Atomic, Molecular, and Optical Physics Volume 57 Issue 6
Page 4877-4888
published_at 1998-06
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| File | |
| Title ( eng ) |
Quantum control of atomic systems by homodyne detection and feedback
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| Creator |
Mahler Günter
Hess Ortwin
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| Source Title |
Physical Review A. Atomic, Molecular, and Optical Physics
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| Volume | 57 |
| Issue | 6 |
| Start Page | 4877 |
| End Page | 4888 |
| Abstract |
We investigate the possibilities of preserving and manipulating the coherence of atomic two-level systems by ideal projective homodyne detection and feedback. For this purpose, the photon emission process is described on time scales much shorter than the lifetime of the excited state using a model based on Wigner- Weisskopf theory. The backaction of this emission process is analytically described as a quantum diffusion of the Bloch vector. It is shown that the evolution of the atomic wave function can be controlled completely using the results of homodyne detection. This allows the stabilization of a known quantum state or the creation of coherent states by a feedback mechanism. However, the feedback mechanism can never compensate the dissipative effects of quantum fluctuations even though the coherent state of the system is known at all times.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 1998-06 |
| Rights |
Copyright (c) 1998 American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 1094-1622
[DOI] 10.1103/PhysRevA.57.4877
[NCID] AA10764867
[DOI] http://dx.doi.org/10.1103/PhysRevA.57.4877
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