the finesse of the micro cavity is measured to be 203, 000 . the corresponding critical photon number mo and critical atom-number no is 0.007and 0.03 respectively 采用腔衰蕩技術(shù)測量了腔的精細(xì)度,測得腔精細(xì)度約203,000。
at last, a maximum disturbance bound is derived for a given mean photon number and transmission length . eavesdropper can be detected with the bound . 2 采用了分束與breidbart基相結(jié)合的竊聽策略討論了竊聽問題并給出了合法用戶在篩選后的密鑰中所能容忍的誤碼率上限公式。
for these states, i study the mean photon number distribution and their non-classical properties, which are photon antibunching, violations of cauchy-schwarz inequality and two-mode squeezing 對這些態(tài),我們研究了平均光子數(shù)分布及其非經(jīng)典特性,它們包括光子聚束,cauchy-schwarz不等式的違背和雙模壓縮。
it is found that if the cavity dissipation is losses and the reservoir is in vacuum, the quantum nonlocality appears periodically . when the cavity dissipation and the average photon number of the reservoir are taken into account, the initial quantum nonlocality will be lost . the rapidity of the loss of the initial quantum nonlocality depends on the amplitude of the initial field, the average photon number n and the cavity damping constant k 結(jié)果表明,如果腔場無損耗且處于真空庫,則量子態(tài)周期性地顯現(xiàn)出一定的非局域性;如果考慮到腔場的損耗和熱庫的平均光子數(shù),那么,量子態(tài)將會喪失它初始的非局域性,初始量子非局域性喪失的速度與初始腔場的幅度、腔的衰減系數(shù)以及熱庫的平均光子數(shù)有關(guān),場越強(qiáng)、平均光子數(shù)和衰減系數(shù)越大,量子非局域性喪失得就越快。
it is found that if the cavity dissipation is losses and the reservoir is in vacuum, the quantum nonlocality appears periodically . when the cavity dissipation and the average photon number of the reservoir are taken into account, the initial quantum nonlocality will be lost . the rapidity of the loss of the initial quantum nonlocality depends on the amplitude of the initial field, the average photon number n and the cavity damping constant k 結(jié)果表明,如果腔場無損耗且處于真空庫,則量子態(tài)周期性地顯現(xiàn)出一定的非局域性;如果考慮到腔場的損耗和熱庫的平均光子數(shù),那么,量子態(tài)將會喪失它初始的非局域性,初始量子非局域性喪失的速度與初始腔場的幅度、腔的衰減系數(shù)以及熱庫的平均光子數(shù)有關(guān),場越強(qiáng)、平均光子數(shù)和衰減系數(shù)越大,量子非局域性喪失得就越快。