Seif Alireza, Wang Yu-Xin, Clerk Aashish A
Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.
Phys Rev Lett. 2022 Feb 18;128(7):070402. doi: 10.1103/PhysRevLett.128.070402.
Understanding whether dissipation in an open quantum system is truly quantum is a question of both fundamental and practical interest. We consider n qubits subject to correlated Markovian dephasing and present a sufficient condition for when bath-induced dissipation can generate system entanglement and hence must be considered quantum. Surprisingly, we find that the presence or absence of time-reversal symmetry plays a crucial role: broken time-reversal symmetry is required for dissipative entanglement generation. Further, simply having nonzero bath susceptibilities is not enough for the dissipation to be quantum. We also present an explicit experimental protocol for identifying truly quantum dephasing dissipation and lay the groundwork for studying more complex dissipative systems and finding optimal noise mitigating strategies.
理解开放量子系统中的耗散是否真的是量子性质的，这是一个具有基础和实际意义的问题。我们考虑了受相关马尔可夫退相影响的n个量子比特，并给出了一个充分条件，用于判断何时浴致耗散能够产生系统纠缠，因此必须被视为量子耗散。令人惊讶的是，我们发现时间反演对称性的存在与否起着关键作用：耗散性纠缠的产生需要时间反演对称性破缺。此外，仅仅有非零的浴磁化率并不足以使耗散成为量子耗散。我们还提出了一个明确的实验方案来识别真正的量子退相耗散，并为研究更复杂的耗散系统和寻找最优的噪声缓解策略奠定基础。
