24 August 2004 Decoherence through superradiance in quantum computers
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Normally, the spontaneous emission of photons due to transitions between functional levels of a qubit is not an important decohering factor because of low probability. However, when the distance between the levels corresponds to frequencies below 100GHz, the wavelength of the photons is in the millimeter range or longer. If this range includes N identical qubits, the probability of the photon emission goes up by a factor N due to Dicke superradiance. This can drastically increase the decoherence rate. Numerical examples with spin and SQUID based qubits are given to illustrate this effect.
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Eugene M Chudnovsky, Eugene M Chudnovsky, } "Decoherence through superradiance in quantum computers", Proc. SPIE 5436, Quantum Information and Computation II, (24 August 2004); doi: 10.1117/12.541528; https://doi.org/10.1117/12.541528

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