Journal
ANNALS OF PHYSICS
Volume 360, Issue -, Pages 556-570Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2015.05.028
Keywords
Superradiance; Cold atom; Cascade atomic transition; Two-photon spontaneous emission; Quantum telecommunication
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST-101-2112-M-001-021-MY3]
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We investigate superradiant cascade emissions from an atomic ensemble driven by two-color classical fields. The correlated pair of photons (signal and idler) is generated by adiabatically driving the system with large-detuned light fields via four-wave mixing. The signal photon from the upper transition of the diamond-type atomic levels is followed by the idler one which can be superradiant due to light-induced dipole dipole interactions. We then calculate the cooperative Lamb shift (CLS) of the idler photon, which is a cumulative effect of interaction energy. We study its dependence on a cylindrical geometry, a conventional setup in cold atom experiments, and estimate the maximum CLS which can be significant and observable. Manipulating the CLS of cascade emissions enables frequency qubits that provide alternative robust elements in quantum network. (C) 2015 Elsevier Inc. All rights reserved.
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