Showing papers by "Myungshik Kim published in 1989"
TL;DR: In this article, the effects of squeezing on number states and on thermal field states are discussed using the second-order correlation functions, and the quasiprobability of the Wigner, Q, and positive P representations are calculated and compared for the squeezed states.
Abstract: Much attention has been given in the past to two classes of squeezed states: the squeezed vacuum and coherent states. Here we study the effects of squeezing on number states and on thermal field states. The statistical properties of these various squeezed states are discussed using the second-order correlation functions. The quasiprobabilities of the Wigner, Q, and positive P representations are calculated and compared for the squeezed states. The Glauber P representation for the squeezed thermal state explicitly shows the limit of its applicability. The photon number distributions of the squeezed number and squeezed thermal states are extensively discussed and new interference effects in phase space are shown to lead to highly structured number distributions.
237 citations
TL;DR: In this paper, the photon statistics of squeezed number states and thermal states were derived using the Wigner functions for the squeezed fields and the photon number distribution was interpreted in terms of phase-space interference.
47 citations
TL;DR: In this article, the importance of collective behavior in two identical two-level atoms was demonstrated by using a cascade three-level atom analysis to show the increasing possibility of simultaneous jumps.
12 citations
01 Jan 1989
TL;DR: In this paper, the statistical properties of the photon number state are calculated and the thermal state can be expressed in terms of the Bose-Einstein weighted sum of photon number states.
Abstract: There has been considerable interest in attempts to produce purely quantum mechanical states of light such as squeezed states, sub—Poissonian states and photon number states1. Amplitude—squeezed states of the sub—Poissonian field have been observed by using a negative amplitude feedback laser incorporating a nondemolition measurement of the photon number2. Amplitude-squeezed states are described as having a “banana” shape in quadrature operator phase space. These banana states can ultimately tend to an annulus in phase space characterising a number state3. Hong and Mandel4 have successfully generated a localised one-photon state by use of an optical shutter, in which “twin” photons (the idler and signal photons) are produced by parametric down conversion, and the signal photon opens a photoelectric detection gate to the idler photon and produces a localised one-photon state. The precisely-defined photon number state can be used as an input field in a squeezing system, such as a parametric amplifier. For this reason, we calculate here the statistical properties of squeezed number states5. By squeezing the photon number state the deterministic photon number is blurred and the quadrature uncertainty is squeezed in one direction. The properties of the state become phase-dependent. The thermal state can be expressed in terms of the Bose-Einstein weighted sum of photon number states6. We can also consider a thermal input field to a squeezing device7. Yurke and coworkers8 have developed a Josephson junction parametric oscillator which has already generated substantial noise reduction in the thermal noise in a microwave cavity.