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Self-restricting Noise and Exponential Relative Entropy Decay Under Unital Quantum Markov Semigroups

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Nicholas LaRacuente proves that unital quantum Markov semigroups—models of open quantum systems—exhibit exponential relative entropy decay toward fixed-point subspaces, even when combining dissipative and Hamiltonian dynamics. The study identifies counterexamples where complete modified logarithmic Sobolev inequalities (CMLSIs) fail, showing these inequalities don’t universally apply when Hamiltonian evolution disrupts detailed balance conditions. Despite early-time deviations, exponential decay re-emerges at finite timescales, challenging assumptions that noise and internal dynamics always accelerate equilibration in quantum systems. A key finding reveals "self-restricting noise": strong dissipation suppresses noise propagation, inversely linking decay rates to dissipation strength, which confines noise to its initial subspace. The work extends equilibration theories to hybrid noise-Hamiltonian systems, offering insights for quantum error mitigation and decoherence-free subspace stabilization in noisy intermediate-scale quantum devices.
Self-restricting Noise and Exponential Relative Entropy Decay Under Unital Quantum Markov Semigroups

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AbstractStates of open quantum systems often decay continuously under environmental interactions. Quantum Markov semigroups model such processes in dissipative environments. It is known that finite-dimensional quantum Markov semigroups with GNS detailed balance universally obey complete modified logarithmic Sobolev inequalities (CMLSIs), yielding exponential decay of relative entropy to a subspace of fixed point states. We analyze continuous processes that combine dissipative with Hamiltonian time-evolution, precluding this notion of detailed balance. First, we find counterexamples to CMLSI-like decay for these processes and determine conditions under which it fails. In contrast, we prove that despite its absence at early times, exponential decay re-appears for unital, finite-dimensional quantum Markov semigroups at finite timescales. Finally, we show that when dissipation is much stronger than Hamiltonian time-evolution, the rate of eventual, exponential decay toward the semigroup's decoherence-free subspace is bounded inversely in the decay rate of the dissipative part alone. Dubbed self-restricting noise, this inverse relationship arises when strong damping suppresses effects that would otherwise spread noise beyond its initial subspace.Featured image: Relative entropy of one qubit within a two-qubit system to its completely mixed fixed point at a fixed time. The two qubits interact via the Hamiltonian as in Example 4.2 of the paper, but only the other qubit is exposed to dissipative noise. As the decay rate induced by that noise increases, the relative entropy shown dips, then rebounds.Popular summaryIn the absence of error correction or perfect isolation, a quantum system's exposure to its environment typically induces noise. It is known that when a system's dynamics arise entirely from noisy environmental interactions, its entropy approaches that of equilibrium at an exponential rate. However, many of these known results do not immediately apply when combining noise with internal processes. Herein, theories of exponential equilibration are extended to a wide class of such combined processes. When noise is restricted to a part of the system, it might still be spread by the system's internal dynamics. In such scenarios, extremely rapid noisy interactions actually reduce the system's decay rate toward equilibrium. This 'self-restriction' occurs because the noise process suppresses interactions between the highly noised part and the rest of the system.► BibTeX data@article{LaRacuente2026selfrestricting, doi = {10.22331/q-2026-03-04-2010}, url = {https://doi.org/10.22331/q-2026-03-04-2010}, title = {Self-restricting {N}oise and {E}xponential {R}elative {E}ntropy {D}ecay {U}nder {U}nital {Q}uantum {M}arkov {S}emigroups}, author = {LaRacuente, Nicholas}, journal = {{Quantum}}, issn = {2521-327X}, publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}}, volume = {10}, pages = {2010}, month = mar, year = {2026} }► References [1] A. A. Clerk, M. H. Devoret, S. M. Girvin, Florian Marquardt, and R. J. Schoelkopf. Introduction to quantum noise, measurement, and amplification. Reviews of Modern Physics, 82 (2): 1155–1208, April 2010. 10.1103/​RevModPhys.82.1155. URL https:/​/​doi.org/​10.1103/​RevModPhys.82.1155. Publisher: American Physical Society. https:/​/​doi.org/​10.1103/​RevModPhys.82.1155 [2] John Preskill. Quantum Computing in the NISQ era and beyond. Quantum, 2: 79, August 2018. ISSN 2521-327X. 10.22331/​q-2018-08-06-79. URL https:/​/​quantum-journal.org/​papers/​q-2018-08-06-79/​. https:/​/​doi.org/​10.22331/​q-2018-08-06-79 https:/​/​quantum-journal.org/​papers/​q-2018-08-06-79/​ [3] Mark M. Wilde.

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Physical Review Research, 3 (1): 013130, February 2021. 10.1103/​PhysRevResearch.3.013130. URL https:/​/​doi.org/​10.1103/​PhysRevResearch.3.013130. Publisher: American Physical Society. https:/​/​doi.org/​10.1103/​PhysRevResearch.3.013130Cited byCould not fetch Crossref cited-by data during last attempt 2026-03-04 09:32:59: Could not fetch cited-by data for 10.22331/q-2026-03-04-2010 from Crossref. This is normal if the DOI was registered recently. Could not fetch ADS cited-by data during last attempt 2026-03-04 09:32:59: No response from ADS or unable to decode the received json data when getting the list of citing works.This Paper is published in Quantum under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Copyright remains with the original copyright holders such as the authors or their institutions. AbstractStates of open quantum systems often decay continuously under environmental interactions. Quantum Markov semigroups model such processes in dissipative environments. It is known that finite-dimensional quantum Markov semigroups with GNS detailed balance universally obey complete modified logarithmic Sobolev inequalities (CMLSIs), yielding exponential decay of relative entropy to a subspace of fixed point states. We analyze continuous processes that combine dissipative with Hamiltonian time-evolution, precluding this notion of detailed balance. First, we find counterexamples to CMLSI-like decay for these processes and determine conditions under which it fails. In contrast, we prove that despite its absence at early times, exponential decay re-appears for unital, finite-dimensional quantum Markov semigroups at finite timescales. Finally, we show that when dissipation is much stronger than Hamiltonian time-evolution, the rate of eventual, exponential decay toward the semigroup's decoherence-free subspace is bounded inversely in the decay rate of the dissipative part alone. Dubbed self-restricting noise, this inverse relationship arises when strong damping suppresses effects that would otherwise spread noise beyond its initial subspace.Featured image: Relative entropy of one qubit within a two-qubit system to its completely mixed fixed point at a fixed time. The two qubits interact via the Hamiltonian as in Example 4.2 of the paper, but only the other qubit is exposed to dissipative noise. As the decay rate induced by that noise increases, the relative entropy shown dips, then rebounds.Popular summaryIn the absence of error correction or perfect isolation, a quantum system's exposure to its environment typically induces noise. It is known that when a system's dynamics arise entirely from noisy environmental interactions, its entropy approaches that of equilibrium at an exponential rate. However, many of these known results do not immediately apply when combining noise with internal processes. Herein, theories of exponential equilibration are extended to a wide class of such combined processes. When noise is restricted to a part of the system, it might still be spread by the system's internal dynamics. In such scenarios, extremely rapid noisy interactions actually reduce the system's decay rate toward equilibrium. This 'self-restriction' occurs because the noise process suppresses interactions between the highly noised part and the rest of the system.► BibTeX data@article{LaRacuente2026selfrestricting, doi = {10.22331/q-2026-03-04-2010}, url = {https://doi.org/10.22331/q-2026-03-04-2010}, title = {Self-restricting {N}oise and {E}xponential {R}elative {E}ntropy {D}ecay {U}nder {U}nital {Q}uantum {M}arkov {S}emigroups}, author = {LaRacuente, Nicholas}, journal = {{Quantum}}, issn = {2521-327X}, publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}}, volume = {10}, pages = {2010}, month = mar, year = {2026} }► References [1] A. A. Clerk, M. H. Devoret, S. M. Girvin, Florian Marquardt, and R. J. Schoelkopf. Introduction to quantum noise, measurement, and amplification. Reviews of Modern Physics, 82 (2): 1155–1208, April 2010. 10.1103/​RevModPhys.82.1155. URL https:/​/​doi.org/​10.1103/​RevModPhys.82.1155. Publisher: American Physical Society. https:/​/​doi.org/​10.1103/​RevModPhys.82.1155 [2] John Preskill. Quantum Computing in the NISQ era and beyond. Quantum, 2: 79, August 2018. ISSN 2521-327X. 10.22331/​q-2018-08-06-79. URL https:/​/​quantum-journal.org/​papers/​q-2018-08-06-79/​. https:/​/​doi.org/​10.22331/​q-2018-08-06-79 https:/​/​quantum-journal.org/​papers/​q-2018-08-06-79/​ [3] Mark M. Wilde.

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