以高概率在谐振器中制备大福克态
Preparation of Large Fock States in Resonators with High Probability
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中文总结 AI 辅助
本文提出结合量子非破坏光子数编码与量子幅度放大的协议，可在色散电路量子电动力学等平台高概率制备含数百个激发的大福克态，还可用于生成双模NOON态。
中文摘要 AI 辅助
大福克态是玻色量子信息和量子增强计量学的重要资源，但在大激发数下以高概率制备它们仍具挑战性：确定性方法所需的控制复杂度不断提升，而基于测量的方法通常存在低预示概率的问题。本文提出一种协议，将量子非破坏光子数编码与量子幅度放大相结合，以实现大福克态的高概率预示生成。该方案从制备为相干态的腔模出发，通过量子相位估计将光子数信息编码至多量子比特寄存器，再利用量子幅度放大提升测量前期望目标结果的概率。该方案可直接在色散电路量子电动力学（circuit-QED）中实现，也可类似地适配至具备QND光子数读出的其他玻色平台，如腔量子电动力学（cavity-QED）。采用最多8个量子比特的寄存器，可实现具有数百个激发的福克态的近确定性制备。此外，本文还表明该协议可作为扩展方案的第一阶段，用于通过条件分束器操作生成双模NOON态。
英文摘要
Large Fock states are important resources for bosonic quantum information and quantum-enhanced metrology, but preparing them with high probability at large excitation numbers remains challenging, as deterministic methods become increasingly control-intensive, while measurement-based approaches typically suffer from low heralding probabilities. Here we propose a protocol that combines quantum nondemolition photon-number encoding with quantum amplitude amplification to enable high-probability heralded generation of large Fock states. Starting from a cavity mode prepared in a coherent state, Quantum Phase Estimation encodes photon-number information into a multi-qubit register, while Quantum Amplitude Amplification boosts the probability of a desired target outcome before measurement. The scheme has an immediate implementation in dispersive circuit-QED, but can be analogously adapted to other bosonic platforms with QND photon-number readout, such as cavity-QED. With a register of up to eight qubits, near-deterministic preparation of Fock states with hundreds of excitations is possible. We also show that the protocol can serve as the first stage of an extension toward generating a two-mode NOON state via a conditional beam-splitter operation.
