Scientific article
English

Ground state entanglement energetics

Published inPhysica. E, Low-dimensional systems and nanostructures, vol. 29, no. 1-2, p. 272-282
Publication date2005
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 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. 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
Main files (2)
Article (Submitted version)
accessLevelPublic
Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN1386-9477
598views
255downloads

Technical informations

Creation30/11/2009 15:06:21
First validation30/11/2009 15:06:21
Update time14/08/2024 08:18:29
Status update14/08/2024 08:18:29
Last indexation29/10/2024 12:35:39
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack