Scientific article
Open access

Ground state entanglement energetics

Published inPhysica. E, Low-dimensional systems and nanostructures, vol. 29, no. 1-2, p. 272-282
Publication date2005

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.

  • Quantum bit
  • Mesoscopic systems
  • Entangled states
  • Quantum system
  • Time correlation function
  • Harmonic oscillators
  • Energy levels
  • Persistent currents
  • Transport processes
  • Cooper pairs
  • Excited states
  • Quantum computer
  • Entanglement energetics
  • Energy fluctuations
  • Decoherence
Citation (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. doi: 10.1016/j.physe.2005.05.024
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Article (Published version)
ISSN of the journal1386-9477

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