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quant-ph2010★ 31 cited
Manufacturing time operators: covariance, selection criteria, and examples
G. C. Hegerfeldt, J. G. Muga, J. Muñoz
We provide the most general forms of covariant and normalized time operators and their probability densities, with applications to quantum clocks, the time of arrival, and Lyapunov…
quant-ph1997★ 5 cited
Unusual light spectra from a two-level atom in squeezed vacuum
G. C. Hegerfeldt, T. I. Sachse, D. G. Sondermann
We investigate the interaction of an atom with a multi-channel squeezed vacuum. It turns out that the light coming out in a particular channel can have anomalous spectral propertie…