Experimental Demonstration of Instrument-specific Quantum Memory Effects and Non-Markovian Process Recovery for Common-Cause Processes

• URL: http://arxiv.org/abs/2003.14045v3
• Date: Thu, 17 Jun 2021 13:36:57 GMT
• Title: Experimental Demonstration of Instrument-specific Quantum Memory Effects and Non-Markovian Process Recovery for Common-Cause Processes
• Authors: Yu Guo, Philip Taranto, Bi-Heng Liu, Xiao-Min Hu, Yun-Feng Huang, Chuan-Feng Li, and Guang-Can Guo
• Abstract summary: The duration, strength and structure of memory effects are crucial properties of physical evolution. We prove this necessity via two paradigmatic processes: future-history correlations in the first process can be erased by an intermediate quantum measurement. We then apply memory truncation techniques to recover an efficient description that approximates expectation values for multi-time observables.
• Score: 1.8631700158180744
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The duration, strength and structure of memory effects are crucial properties of physical evolution. Due to the invasive nature of quantum measurement, such properties must be defined with respect to the probing instruments employed. Here, using a photonic platform, we experimentally demonstrate this necessity via two paradigmatic processes: future-history correlations in the first process can be erased by an intermediate quantum measurement; for the second process, a noisy classical measurement blocks the effect of history. We then apply memory truncation techniques to recover an efficient description that approximates expectation values for multi-time observables. Our proof-of-principle analysis paves the way for experiments concerning more general non-Markovian quantum processes and highlights where standard open systems techniques break down.

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