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  1.  43
    The Wigner Phase-Space Description of Collision Processes.Hai-Woong Lee & Marlan O. Scully - 1983 - Foundations of Physics 13 (1):61-72.
    This year marks the 50th anniversary of the birth of the celebrated Wigner distribution function. Many advances made in various areas of science during the 50 year period can be attributed to the physical insights that the Wigner distribution function provides when applied to specific problems. In this paper the usefulness of the Wigner distribution function in collision theory is described.
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  2.  72
    Wigner Trajectories of a Gaussian Wave Packet Perturbed by a Weak Potential.Hai-Woong Lee - 1992 - Foundations of Physics 22 (8):995-1010.
    Trajectories along which phase-space points of the Wigner distribution function move are computed for a Gaussian wave packet moving under the influence of a weak perturbative potential. The potentials considered are a potential step, a potential barrier, and a periodic potential. Trajectories computed exhibit the complex, nonlocal nature of quantum dynamics. It is seen that quantum interference, which takes place in the time development of the wave packet, is taken care of in a simple way by the Wigner trajectory method (...)
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  3.  81
    Density Matrix in Quantum Mechanics and Distinctness of Ensembles Having the Same Compressed Density Matrix.Gui Lu Long, Yi-Fan Zhou, Jia-Qi Jin, Yang Sun & Hai-Woong Lee - 2006 - Foundations of Physics 36 (8):1217-1243.
    We clarify different definitions of the density matrix by proposing the use of different names, the full density matrix for a single-closed quantum system, the compressed density matrix for the averaged single molecule state from an ensemble of molecules, and the reduced density matrix for a part of an entangled quantum system, respectively. We show that ensembles with the same compressed density matrix can be physically distinguished by observing fluctuations of various observables. This is in contrast to a general belief (...)
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