Open AccessDisplaced Excited Squeezed Vacuum States and Their Propertities
Author(s) -
Zhigao Sun,
Heng Fan
Publication year - 2000
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.49.74
Subject(s) - physics , wigner distribution function , photon , excited state , coherence (philosophical gambling strategy) , quantum mechanics , function (biology) , product (mathematics) , excitation , distribution function , vacuum state , coherent states , squeezed coherent state , atomic physics , quantum , geometry , mathematics , evolutionary biology , biology
We introduce the states D(z)a\+\{+\+m\}S(r)|0〉 and examine their properties . Such states are checked to be complete vectors via the IWOP (Integration W ithin an Ordered Product of operators) technique. We find largerscale macrosco pic oscillations of photon distribution after the squeezed vacuum states being e xcited and displaced. On contrary to the bunching photons of the squeezed vacuum states as the displacing parameter |z| and the excitation number m are both small photons coherence can exhibit antibunching effect. The quasiproba bility distribution functions (Husimi Q( 醆+*) function and Wigner W(q p) function) are derived and their dependences on the three parameters (z m r) are discussed. The Wigner function obviously displays their nonclassical fe ature.