High-fidelity bosonic quantum state transfer using imperfect transducers and interference
High-fidelity bosonic quantum state transfer using imperfect transducers and interference
复制标题
DOI：
10.1038/s41534-019-0143-1
复制
发表时间：
2019-04-23
影响因子：
7.6
通讯作者：
Clerk, Aashish A.
中科院分区：
文献类型：
--
作者：
Lau, Hoi-Kwan;Clerk, Aashish A.
我们考虑不完美的双模玻色子量子换能器，由于耦合强度不足或其他哈密顿非理想性，它们无法完全转移初始源系统量子态。我们表明，这种换能器通常可以通过使用干涉和相敏放大来完善。我们的方法基于这样的认识：一种特殊类型的不完美换能器（实现交换量子不可拆卸（QND）门的换能器）可以使用前馈和/或注入挤压制成完美的单向换能器。我们表明，通过重复不完美的换能操作两次并散布放大，可以将通用的不完美换能器简化为这种情况。至关重要的是，我们的方案仅需要能够对所涉及的两种模式之一实施压缩操作和/或零差测量。因此，它非常适合控制两个耦合系统的能力不对称的方案（例如，微波到光学的量子状态转移）。我们还讨论了一种不需要注入挤压和/或前馈操作的校正协议。
We consider imperfect two-mode bosonic quantum transducers that cannot completely transfer an initial source-system quantum state due to insufficient coupling strength or other Hamiltonian non-idealities. We show that such transducers can generically be made perfect by using interference and phase-sensitive amplification. Our approach is based on the realization that a particular kind of imperfect transducer (one which implements a swapped quantum non-demolition (QND) gate) can be made into a perfect one-way transducer using feed-forward and/or injected squeezing. We show that a generic imperfect transducer can be reduced to this case by repeating the imperfect transduction operation twice, interspersed with amplification. Crucially, our scheme only requires the ability to implement squeezing operations and/or homodyne measurement on one of the two modes involved. It is thus ideally suited to schemes where there is an asymmetry in the ability to control the two coupled systems (e.g., microwave-to-optics quantum state transfer). We also discuss a correction protocol that requires no injected squeezing and/or feed-forward operation.