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quant-ph2020★ 4 cited
Quantum versus thermal fluctuations in the harmonic chain and experimental implications
K. Schönhammer
The nonzero ground-state energy of the quantum mechanical harmonic oscillator implies quantum fluctuations around the minimum of the potential with the mean square value proportion…
quant-ph2002★ 6 cited
Canonically conjugate pairs and phase operators
K. Schonhammer
For quantum mechanics on a lattice the position (``particle number'') operator and the quasi-momentum (``phase'') operator obey canonical commutation relations (CCR) only on a dens…