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Invariant operator theory for the single-photon energy in time-varying media |
Choi Jeong-Ryeol† |
School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-710, Republic of Korea |
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Abstract After the birth of quantum mechanics, the notion in physics that the frequency of light is the only factor that determines the energy of a single photon has played a fundamental role. However, under the assumption that the theory of Lewis--Riesenfeld invariants is applicable in quantum optics, it is shown in the present work that this widely accepted notion is valid only for light described by a time-independent Hamiltonian, i.e., for light in media satisfying the conditions, $\varepsilon(t)=\varepsilon(0)$, $\mu(t)=\mu(0)$, and $\sigma(t)=0$ simultaneously. The use of the Lewis--Riesenfeld invariant operator method in quantum optics leads to a marvelous result:the energy of a single photon propagating through time-varying linear media exhibits nontrivial time dependence without a change of frequency.
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Accepted manuscript online:
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PACS:
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42.50.-p
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(Quantum optics)
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02.30.Tb
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(Operator theory)
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32.80.-t
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(Photoionization and excitation)
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Fund: This work was supported by National
Research Foundation of Korea Grant funded by the Korean Government (No.~2009-0077951). |
Cite this article:
Choi Jeong-Ryeol Invariant operator theory for the single-photon energy in time-varying media 2010 Chin. Phys. B 19 010306
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