Information thermodynamics is constructed in generalized probabilistic theories such that entropy-non-decreasing measurements prevent second-law-violating work extraction, with explicit counterexample GPTs when this fails.
Fundamental energy cost for quantum measurement
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abstract
Measurements and feedback are essential in the control of any device operating at the quantum scale and exploiting the features of quantum physics. As the number of quantum components grows, it becomes imperative to consider the energetic expense of such elementary operations. Here, we derive energy requirements for general quantum measurement, extending previous models and obtaining stronger bounds in relevant situations, and then study two important classes of measurements in detail. One is the projective measurement, where we obtain the exact cost rather than a lower bound, and the other is the so-called inefficient measurement, in which we explicitly show that energy extraction is possible. As applications, we derive the energy-precision trade-off in quantum Zeno stabilisation schemes and the exact energy expense for quantum error correction. Our results constitute fundamental energetic limitations against which to benchmark implementations of future quantum devices as they grow in complexity.
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quant-ph 3years
2026 3roles
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In quadratic open quantum systems, a coherence-retention parameter in stroboscopic reset channels produces monotonic growth in retained coherence but nonmonotonic heat current, with coherence-optimal protocols driven toward full preservation rather than maximum dissipation.
A quantum Zeno dynamics protocol confines the evolution of a finite-time Otto-cycle quantum heat engine to a subspace that preserves instantaneous energy populations, recovering quasistatic efficiency with added thermodynamic costs from monitoring and switching.
citing papers explorer
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Information Thermodynamics in Generalized Probabilistic Theories
Information thermodynamics is constructed in generalized probabilistic theories such that entropy-non-decreasing measurements prevent second-law-violating work extraction, with explicit counterexample GPTs when this fails.
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Thermodynamics of Coherence-Selective Quantum Reset Protocols
In quadratic open quantum systems, a coherence-retention parameter in stroboscopic reset channels produces monotonic growth in retained coherence but nonmonotonic heat current, with coherence-optimal protocols driven toward full preservation rather than maximum dissipation.
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Zeno-Assisted Quantum Heat Engines
A quantum Zeno dynamics protocol confines the evolution of a finite-time Otto-cycle quantum heat engine to a subspace that preserves instantaneous energy populations, recovering quasistatic efficiency with added thermodynamic costs from monitoring and switching.