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Two-Qubit Engine Fueled by Entanglement and Local Measurements
Léa Bresque1, Patrice A Camati1, Spencer Rogers2
1Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France.
Physical Review Letters
|April 9, 2021
Summary
We developed a novel quantum engine using entanglement and local measurements. This engine can transfer energy from one qubit to another, offering new possibilities for quantum energy transfer.
Area of Science:
- Quantum mechanics
- Quantum thermodynamics
- Quantum information science
Background:
- Quantum engines offer a new paradigm for energy conversion at the nanoscale.
- Entanglement and local measurements are key resources in quantum thermodynamics.
- Understanding the fueling mechanisms of quantum engines is crucial for their development.
Purpose of the Study:
- To introduce a two-qubit engine powered by entanglement and local measurements.
- To demonstrate energy extraction from detuned qubits via coherent excitation exchange.
- To generalize the engine to an N-qubit chain and explore energy up-conversion.
Main Methods:
- Utilizing a two-qubit system as the working substance.
- Employing local measurements and entanglement as driving mechanisms.
- Modeling local measurements as qubit-meter entanglement.
- Analyzing energy transfer through coherent excitation exchange.
Main Results:
- Demonstrated a quantum engine powered by entanglement and local measurements.
- Showed coherent energy extraction from detuned qubits.
- Established a method for up-converting energy along an N-qubit chain.
- Identified the energetic cost of erasing quantum correlations as the fuel.
Conclusions:
- Measurement-powered engines can be extended to composite quantum systems.
- Provided a microscopic interpretation of the fueling mechanism in quantum engines.
- Opened new avenues for research in quantum thermodynamics and quantum energy transfer.
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