有限截止量子剪刀混合预示无噪放大
Hybrid Heralded Noiseless Amplification with Finite-Cutoff Quantum Scissors
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中文总结 AI 辅助
该研究在两个单模压缩器间插入有限截止量子剪刀NLA，探究其混合放大器的增益提升机制，发现随截止值增加保真度提升，高截止时趋近理想NLA性能。
中文摘要 AI 辅助
无噪线性放大器（NLA）可概率性放大光学态，无需确定性相位不敏感放大所需的噪声。我们研究一种混合放大器，其中有限截止量子剪刀NLA被置于两个单模压缩器之间。基于理想（无限截止）NLA的分析发现，压缩可提升增益。我们探究随着量子剪刀截止值增加，该增益提升的物理机制。低截止序列展示了该增益提升如何从截断的福克空间中产生。截止值3是最低阶，此时额外的偶光子和奇光子分量均可对增益提升有贡献，尽管系数存在一定偏移会降低保真度。随着截止值增加，保真度提升。然而，与理想变换不同，有限截止器件依赖于相干振幅相对于压缩轴的相位，与反压缩对齐的态需要更高的截止值才能实现高保真度。我们追踪其至高截止值的行为，最终看到理想理论所预测的性能显现。
英文摘要
A noiseless linear amplifier (NLA) can probabilistically amplify an optical state without the noise required by deterministic phase-insensitive amplification. We study a hybrid amplifier in which a finite-cutoff quantum-scissor NLA is placed between two single-mode squeezers. Analysis based on an ideal (infinite cutoff) NLA finds a gain enhancement from the squeezing. We explore the physics of this enhancement as the cutoff of the quantum scissors is increased. The low-cutoff sequence shows how this gain enhancement emerges from the truncated Fock space. Cutoff 3 is the lowest order at which the additional even- and odd-photon components can both contribute to gain enhancement, albeit with some skewing of the coefficients which reduces the fidelity. As the cutoff is increased the fidelity improves. However, unlike the ideal transformation, the finite-cutoff device depends on the phase of the coherent amplitude relative to the squeezing axes, with states aligned with the anti-squeezing requiring higher cutoffs to achieve high fidelity. We track behavior to high cutoffs and eventually see the performance predicted in the ideal theory emerge.
发表机构
- University of Queensland（昆士兰大学）
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