Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities
Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities
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DOI：
10.1103/physrevlett.124.160501
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发表时间：
2020-04-20
影响因子：
8.6
通讯作者：
Englund, Dirk R.
中科院分区：
文献类型：
--
作者：
Heuck, Mikkel;Jacobs, Kurt;Englund, Dirk R.
我们表明，相对简单的集成光子电路有潜力利用体光学非线性实现光子量子比特之间的高保真确定性控制相位门。该门是通过使用动态改变有效腔波导耦合率的强经典控制场将行进的连续模式光子转换为静止腔模式而实现的。这种结构之所以成功，是因为它减少了伴随光学非线性作用的波包畸变[J]。夏皮罗。Rev. A 73,062305 (2006)；J. Gea-Banacloche，物理学家生物工程学报，2010,31(2)。我们证明了高保真门可以通过chi（(3)）材料中的自相位调制以及chi（(2)）材料中的二次谐波产生来实现。对于固定持续时间的入射光子波包，随着存储时间的增加，栅极保真度逐渐趋于一致。我们还表明，动态耦合空腔可以在由于损耗和波包失真引起的误差之间进行权衡。我们提出的架构代表了一种实际实现量子门的新方法，它是室温兼容的，并且只依赖于单独演示的组件。
We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006); J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)]. We show that high-fidelity gates can be achieved with self-phase modulation in chi((3)) materials as well as second-harmonic generation in chi((2)) materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is room-temperature compatible and only relies on components that have been individually demonstrated.