Abstract
The problem of phase in quantum mechanics is an old one but one that has received increasing attention of late. For a single-mode radiation field with annihilation operator â there have been two recent formulations for its quantum phase, Pegg and Bamett1 have created a Hermitian phase operator by truncating the state space associated with â to the subspace spanned by the number kets {|n〉:0 ≤ n ≤ S}.
© 1990 Optical Society of America
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