Ground State Entanglement Energetics
arXiv:quant-ph/0501018 · doi:10.1016/j.physe.2005.05.024
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.
10 pages, 6 figures
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Cited by in corpus (17)
- Bipartite Fluctuations as a Probe of Many-Body Entanglement
- Thermodynamics of a subensemble of a canonical ensemble
- Information and entropy in quantum Brownian motion: Thermodynamic entropy versus von Neumann entropy
- Effective thermodynamics of strongly coupled qubits
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- The second law of thermodynamics in the quantum Brownian oscillator at an arbitrary temperature
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- Quantum and statistical mechanics in open systems: theory and examples