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Transport and Nonreciprocity in Monitored Quantum Devices: An Exact Study
João Ferreira1, Tony Jin1,2, Jochen Mannhart3
1Department of Quantum Matter Physics, École de Physique University of Geneva, 1211 Geneva, Switzerland.
Physical Review Letters
|April 13, 2024
Summary
Continuous monitoring of fermionic systems reveals measurement-induced inelastic processes. These processes enable nonreciprocal currents and work extraction without feedback control, offering new avenues in quantum thermodynamics.
Area of Science:
- Quantum thermodynamics
- Condensed matter physics
- Open quantum systems
Background:
- Noninteracting fermionic systems are fundamental in quantum mechanics.
- Continuous monitoring introduces unique dynamics and influences system behavior.
- Biased reservoirs drive particle and energy flow in quantum systems.
Purpose of the Study:
- To derive exact formulas for particle and heat flows in continuously monitored fermionic systems.
- To investigate the role of monitoring strength on system currents.
- To explore measurement-induced work extraction and cooling mechanisms.
Main Methods:
- Derivation of exact formulas for particle and heat flows by averaging over measurement outcomes.
- Analysis of elastic and inelastic current components.
- Application of a formalism to specific monitoring schemes.
Main Results:
- Exact formulas for particle and heat flows were derived.
- Competing elastic and inelastic current components were identified, dependent on monitoring strength (γ).
- Monitor-induced inelastic processes lead to nonreciprocal currents and enable work extraction without active feedback.
Conclusions:
- Continuous monitoring can induce nonreciprocal currents and facilitate work extraction.
- The study provides a framework for understanding measurement-driven quantum thermodynamics.
- Optimal performance regimes were identified for specific monitoring strengths, beyond perturbative limits.
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