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Ground state entanglement energetics

Jordan, Andrew N.
Published in Physica E: Low-dimensional Systems and Nanostructures. 2005, vol. 29, no. 1-2, p. 272-282
Abstract We consider the ground state of simple quantum systems coupled to an environment. In general the system is entangled with its environment. As a consequence, even at zero temperature, the energy of the system is not sharp: a projective measurement can find the system in an excited state. We show that energy fluctuation measurements at zero temperature provide entanglement information. For two-state systems which exhibit a persistent current in the ground state, energy fluctuations and persistent current fluctuations are closely related. The harmonic oscillator serves to illustrate energy fluctuations in a system with an infinite number of states. In addition to the energy distribution we discuss the energy-energy time-correlation function in the zero-temperature limit.
Keywords Quantum bitMesoscopic systemsEntangled statesQuantum systemTime correlation functionHarmonic oscillatorsEnergy levelsPersistent currentsTransport processesCooper pairsExcited statesQuantum computerEntanglement energeticsEnergy fluctuationsDecoherence
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BUTTIKER, Markus, JORDAN, Andrew N. Ground state entanglement energetics. In: Physica E: Low-dimensional Systems and Nanostructures, 2005, vol. 29, n° 1-2, p. 272-282. https://archive-ouverte.unige.ch/unige:4170

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Deposited on : 2009-11-30

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