Generation of photonic superposition states by two-photon absorption

Pure superposition states obtained with two-level atoms, photons, nuclear spins, etc. are of great importance in quantum computing and quantum cryptography. The physical realization of photon qubits (quantum bits) is partially realized with the aid of two-photon absorption, which gives rise to stron...

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Bibliographic Details
Published in:Journal of luminescence 2001-12, Vol.94, p.815-819
Main Authors: Alexanian, Moorad, Bose, Subir K.
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Coherence
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonclassical field states
squeezed, antibunched and sub-poissonian states
operational definitions of the phase of the field
phase measurements
Optics
Phase states
Physics
Quantum computation
Quantum information
Quantum optics
Qubits
Two-photon absorption
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Summary:Pure superposition states obtained with two-level atoms, photons, nuclear spins, etc. are of great importance in quantum computing and quantum cryptography. The physical realization of photon qubits (quantum bits) is partially realized with the aid of two-photon absorption, which gives rise to strong coherence of the off-diagonal matrix element between the vacuum and the one-photon state. Although a true phase state is not obtained, nevertheless, the mixed state produced is rather close to being a pure state.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(01)00374-X