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unige:4170 
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Ground state entanglement energetics |
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| Authors | ||
| 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 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 | |
| Identifiers | arXiv: quant-ph/0501018 | |
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| 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. https://archive-ouverte.unige.ch/unige:4170 |
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