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Enhanced energy relaxation process of a quantum memory coupled to a superconducting qubit

机译：与超导量子位耦合的量子存储器的增强的能量弛豫过程

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摘要

For quantum information processing, each physical system has a different advantage as regards implementation, so hybrid systems that benefit from the advantage of several systems would provide a promising approach. One common hybrid approach involves combining a superconducting qubit as a controllable qubit and another quantum system with a long coherence time as a memory qubit. The use of a superconducting qubit gives us excellent controllability of the quantum states, and the memory qubit is capable of storing information for a long time. It has been believed that selective coupling can be realized between a superconducting qubit and a memory qubit by tuning the energy splitting between them. However, we have shown that this detuning approach has a fundamental drawback as regards energy leakage from the memory qubit. Even if the superconducting qubit is effectively separated by reasonable detuning, a non-negligible incoherent energy relaxation in the memory qubit occurs via residual weak coupling when the superconducting qubit is affected by severe dephasing. This energy transport from the memory qubit to the control qubit can be interpreted as the appearance of the anti-quantum Zeno effect induced by the fluctuation in the superconducting qubit. We also discuss possible ways to avoid this energy relaxation process, which is feasible with existing technology.
机译：对于量子信息处理，每个物理系统在实现方面都具有不同的优势，因此受益于多个系统优势的混合系统将提供一种有前途的方法。一种常见的混合方法涉及将超导量子位作为可控量子位与另一种具有长相干时间的量子系统结合为存储量子位。超导量子位的使用为我们提供了出色的量子态可控性，并且存储器量子位能够长时间存储信息。已经相信，可以通过调节超导量子位和存储器量子位之间的能量分配来实现选择性耦合。但是，我们已经表明，这种失谐方法在从内存量子位泄漏能量方面具有根本的缺陷。即使通过合理的失谐有效地分离了超导量子位，当超导量子位受到严重的相移影响时，通过剩余的弱耦合也会在存储量子位中产生不可忽略的非相干能量弛豫。从存储量子位到控制量子位的这种能量传输可以解释为由超导量子位的波动引起的反量子芝诺效应的出现。我们还讨论了避免这种能量松弛过程的可能方法，这对于现有技术是可行的。

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