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Engineering integrated photonics for heralded quantum gates

机译:工程集成光子学用于先导量子门

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摘要

Scaling up linear-optics quantum computing will require multi-photon gates which are compact, phase-stable, exhibit excellent quantum interference, and have success heralded by the detection of ancillary photons. We investigate the design, fabrication and characterisation of the optimal known gate scheme which meets these requirements: the Knill controlled-Z gate, implemented in integrated laser-written waveguide arrays. We show device performance to be less sensitive to phase variations in the circuit than to small deviations in the coupler reflectivity, which are expected given the tolerance values of the fabrication method. The mode fidelity is also shown to be less sensitive to reflectivity and phase errors than the process fidelity. Our best device achieves a fidelity of 0.931 ± 0.001 with the ideal 4 × 4 unitary circuit and a process fidelity of 0.680 ± 0.005 with the ideal computational-basis process.
机译:扩大线性光学量子计算将需要紧凑,相位稳定,表现出出色的量子干扰并且通过检测辅助光子预示着成功的多光子门。我们研究了满足以下要求的最佳已知门方案的设计,制造和表征:在集成激光写入波导阵列中实现的Knill可控Z门。我们显示出器件性能对电路中的相位变化比对耦合器反射率的小偏差不那么敏感,这在给定制造方法的公差值的情况下是可以预期的。与过程保真度相比,模式保真度还显示出对反射率和相位误差不那么敏感。我们最好的设备在理想的4×4单一电路下达到0.931 0.9±0.001的保真度,在理想的基础计算下达到0.680±0.005的保真度。

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