CAJ | 학술논문

从相位分布和Wigner函数两个方面研究了任意两个相干态|β〉 and |mβeiδ〉的叠加态的量子统计性质.结果表明这种叠加态的非经典特性与β2,振幅系数m,相干态间的位相差δ以及叠加系数间的位相差φ都有关.当参量选择合适,这种叠加态存在着量子效应.计算了两个相干态等几率混合系综的相位分布和Wigner函数,经过与前者比较,结果表明由于相干项的存在,使得叠加态具有很好的量子力学行为.
종상위분포화Wigner함수량개방면연구료임의량개상간태|β〉 and |mβeiδ〉적첩가태적양자통계성질.결과표명저충첩가태적비경전특성여β2,진폭계수m,상간태간적위상차δ이급첩가계수간적위상차φ도유관.당삼량선택합괄,저충첩가태존재착양자효응.계산료량개상간태등궤솔혼합계종적상위분포화Wigner함수,경과여전자비교,결과표명유우상간항적존재,사득첩가태구유흔호적양자역학행위.
The quantum statistical properties of the superposition state, which involve two arbitrary coherent states |β〉 and |mβeiδ〉, are investigated from two aspects, such as the phase distribution and Winger function. The results show that the non-classical properties of the superposition state depend on β2, amplitude coefficient m, the phase difference between the coherent states δ, and the phase difference between the superposition coefficients φ. When selected suitable parameters the superposition state exhibits quantum effect. The phase distribution and Wigner function of an equally populated mixture of two coherent states are derived, too. By comparison the results show that the presence of the coherence terms makes the superposition state with full quantum-mechanical behavior.