Quantum

Quantum non-Markovian response spectra

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Briefings

A new method using response matrices and controlled interventions reveals the temporal structure of environmental memory in quantum systems. By observing the system alone, researchers can characterize how future observations change across different histories, allowing for the certification of quantum memory and the diagnosis of correlated noise without direct environmental measurement.

Key points

• The method introduces a response matrix that records how future observations change across different controlled histories using only system observations.
• The spectrum of this matrix characterizes the temporal structure of environmental memory and how it persists under system resets.

Context and limitations

The framework is established theoretically and applied to an interacting spin process and a two-qubit benchmark; full characterization of environmental memory across all quantum systems remains an open challenge.

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