Decoherence in Quantum Systems

Details Decoherence in Quantum Systems Decoherence in Quantum Systems

2005-01-18

arxiv.org/abs/quant-ph/0501097v1

Physics

Quantum Physics

To be published in Proceedings of the 2004 IEEE NTC Quantum Device Technology Workshop, IEEE Transactions on Nanotechnology, 4

Scientific paper

10.1109/TNANO.2004.840158

We discuss various definitions of decoherence and how it can be measured. We compare and contrast decoherence in quantum systems with an infinite number of eigenstates (such as the free particle and the oscillator) and spin systems. In the former case, we point out the essential difference between assuming "entanglement at all times" and entanglement with the reservoir occuring at some initial time. We also discuss optimum calculational techniques in both arenas.

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