论文标题
大振幅高保真猫状态的量子工程算法与k梁拆分器的设置和效率低下的光子数解析检测
Algorithm of quantum engineering of large-amplitude high-fidelity cat states in setup with k beam splitters and with inefficient photon number resolving detection
论文作者
论文摘要
我们使用单个模式挤压真空（SMSV）状态作为资源，提出了大振幅> 5高振幅> 0.99的量子工程算法。具有任意透射率和反射系数的K梁拆分器（BSS）依次遵循彼此的频率和反射率系数，将多光子状态重定向到同时测量的测量模式，通过光子数（PNR）检测器同时测量。我们表明，与单个PNR检测器版本中的实现相比，多光子状态分裂保证了CAT状态发生器的成功概率的显着增加，并且对理想PNR检测器的要求更少。我们证明，输出SCS的忠诚度及其成功概率相互冲突（可以量化），而PNR探测器无效，尤其是当减去大量（例如100）光子数量的光子数量（即，即在成功概率中增加忠诚度的忠诚度以急剧下降而增加）。通常，使用两个BS的设置中最多从初始SMSV中减去20个光子的策略是可以在具有两个低效的PNR检测器的幅度<3的SCSS发电机的输出时获得足够高的忠诚度和成功概率的值。
We present an algorithm of quantum engineering of large-amplitude>5 high-fidelity>0.99 even/odd Schrodinger cat states (SCSs) using a single mode squeezed vacuum (SMSV) state as resource. Set of k beam splitters (BSs) with arbitrary transmittance and reflectance coefficients sequentially following each other acts as a hub that redirects a multiphoton state into the measuring modes simultaneously measured by photon number resolving (PNR) detectors. We show that the multiphoton state splitting guarantees significant increase of the success probability of the cat state generator compared to its implementation in a single PNR detector version and imposes less requirements on ideal PNR detectors. We prove that the fidelity of the output SCSs and its success probability are in conflict with each other (which can be quantified) in a scheme with ineffective PNR detectors, especially when subtracting large (say, 100) number of photons, i.e., increasing the fidelity to perfect values leads to a sharp decrease in the success probability. In general, the strategy of subtracting up to 20 photons from initial SMSV in setup with two BSs is acceptable for achieving sufficiently high values of the fidelity and success probability at the output of the generator of the SCSs of amplitude <3 with two inefficient PNR detectors.
