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

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.

arXiv comment4.5+7 pages; 7 figures; 62 references

References in corpus (41)

• Multi-photon entanglement and interferometry
• Non-Markovian dynamics in open quantum systems
• The Role of Relative Entropy in Quantum Information Theory
• 14-qubit entanglement: creation and coherence
• Quantum Non-Markovianity: Characterization, Quantification and Detection
• Quantum correlations with no causal order
• Ultra-Large-Scale Continuous-Variable Cluster States Multiplexed in the Time Domain
• Experimental control of the transition from Markovian to non-Markovian dynamics of open quantum systems
• Theoretical framework for quantum networks
• Quantum Circuits Architecture
• Concepts of quantum non-Markovianity: a hierarchy
• Non-Markovian quantum processes: complete framework and efficient characterisation
• Operational Markov condition for quantum processes
• On measures of non-Markovianity: divisibility vs. backflow of information
• Quantum causal modelling
• Quantum Channels with Memory
• Beating the channel capacity limit for superdense coding with entangled ququarts
• Demonstration of non-Markovian process characterisation and control on a quantum processor
• Causal and causally separable processes
• Experimental demonstration of entanglement-enhanced classical communication over a quantum channel with correlated noise
• Completely Positive Divisibility Does Not Mean Markovianity
• Linear Optics Simulation of Non-Markovian Quantum Dynamics
• Comparing different non-Markovianity measures: A case study
• Operational approach to open dynamics and quantifying initial correlations
• When is a non-Markovian quantum process classical?
• Quantum walk as a generalized measuring device
• An introduction to operational quantum dynamics
• Phenomenological memory-kernel master equations and time-dependent Markovian processes
• Kolmogorov extension theorem for (quantum) causal modelling and general probabilistic theories
• Quantum Markov Order
• The Structure of Quantum Stochastic Processes with Finite Markov Order
• The Operator Tensor Formulation of Quantum Theory
• Experimental Measurement-Device-Independent Quantum Steering and Randomness Generation Beyond Qubits
• Experimental implementation of fully controlled dephasing dynamics and synthetic spectral densities
• Updating the Born rule
• Operational General Relativity: Possibilistic, Probabilistic, and Quantum
• Reconstructing open quantum system dynamics with limited control
• Positivity in the presence of initial system-environment correlation
• Preparation of states in open quantum mechanics
• Probing the Non-Classicality of Temporal Correlations
• Memory Effects in Quantum Processes

Cited by in corpus (15)

• Non-Markovian Quantum Process Tomography
• Experimental Aspects of Indefinite Causal Order in Quantum Mechanics
• Non-Markovian Memory Strength Bounds Quantum Process Recoverability
• Simple and maximally robust processes with no classical common-cause or direct-cause explanation
• Characterising the Hierarchy of Multi-time Quantum Processes with Classical Memory
• Optomechanical second-order sidebands and group delays in a spinning resonator with parametric amplifier and non-Markovian effects
• Noise mitigation in quantum teleportation
• Preserving quantum correlations and coherence with non-Markovianity
• Hidden Quantum Memory: Is Memory There When Somebody Looks?
• Compression of Entanglement Improves Quantum Communication
• Hamiltonian characterisation of multi-time processes with classical memory
• Dressed bound states and non-Markovian dynamics with a whispering-gallery-mode microcavity coupled to a two-level atom and a semi-infinite photonic waveguide
• Leggett-Garg inequalities for multitime processes
• Purely quantum memory in closed systems observed via imperfect measurements
• Robust Error Accumulation Suppression for Quantum Circuits