Distinguishing decoherence from alternative quantum theories by dynamical decoupling
Distinguishing decoherence from alternative quantum theories by dynamical decoupling
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DOI：
10.1103/physreva.92.022102
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发表时间：
2014-05
影响因子：
2.9
通讯作者：
C. Arenz;R. Hillier;M. Fraas;D. Burgarth
中科院分区：
文献类型：
--
作者：
C. Arenz;R. Hillier;M. Fraas;D. Burgarth
量子力学基础中的一个长期挑战是验证替代的崩塌理论，尽管它们在数学上与退相干相似。为此，我们提出了一种基于动态解耦的方法。实验观测到的解耦误差在快速解耦操作极限内的非零饱和，可以为其他量子理论提供依据。崩塌模型预测的低衰减率是具有挑战性的，但高保真测量以及量子比特去耦合方案的最新进展让我们探索出与基于宏观叠加的实验相似的参数区域。作为分析的一部分，我们证明了无界哈密顿可以完全解耦。我们通过将Lindbladian扩展为诱导指数衰减的完全哈密顿模型来证明这一点。
A long-standing challenge in the foundations of quantum mechanics is the verification of alternative collapse theories despite their mathematical similarity to decoherence. To this end, we suggest a method based on dynamical decoupling. Experimental observation of nonzero saturation of the decoupling error in the limit of fast-decoupling operations can provide evidence for alternative quantum theories. The low decay rates predicted by collapse models are challenging, but high-fidelity measurements as well as recent advances in decoupling schemes for qubits let us explore a similar parameter regime to experiments based on macroscopic superpositions. As part of the analysis we prove that unbounded Hamiltonians can be perfectly decoupled. We demonstrate this on a dilation of a Lindbladian to a fully Hamiltonian model that induces exponential decay.