Physics – Quantum Physics
Scientific paper
2005-01-04
Physica E 29, 272 (2005)
Physics
Quantum Physics
10 pages, 6 figures
Scientific paper
10.1016/j.physe.2005.05.024
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.
Buttiker Markus
Jordan Andrew N.
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