UNIGE document Scientific Article
previous document  unige:4170  next document
add to browser collection

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
Full text
(ISO format)
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

233 hits



Deposited on : 2009-11-30

Export document
Format :
Citation style :