An Interaction-Free Quantum Measurement-Driven Engine

Abstract

Recently highly-efficient quantum engines were devised by exploiting the stochastic energy changes induced by quantum measurement. Here we show that such an engine can be based on an interaction-free measurement, in which the meter seemingly does not interact with the measured object. We use a modified version of the Elitzur-Vaidman bomb tester, an interferometric setup able to detect the presence of a bomb triggered by a single photon without exploding it. In our case, a quantum bomb subject to a gravitational force is initially in a superposition of being inside and outside one of the interferometer arms. We show that the bomb can be lifted without blowing up. This occurs when a photon traversing the interferometer is detected at a port that is always dark when the bomb is located outside the arm. The required potential energy is provided by the photon (which plays the role of the meter) even though it was not absorbed by the bomb. A natural interpretation is that the photon traveled through the arm which does not contain the bomb -- otherwise the bomb would have exploded -- but it implies the surprising conclusion that the energy exchange occurred at a distance despite a local interaction Hamiltonian. We use the weak value formalism to support this interpretation and find evidence of contextuality. Regardless of interpretation, this interaction-free quantum measurement engine is able to lift the most sensitive bomb without setting it off.

8 pages, 3 figures

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• A quantum Stirling heat engine operating in finite time
• Delayed choice of paths selected by grin and snarl of quantum Cheshire Cat
• Coherent interaction-free detection of microwave pulses with a superconducting circuit
• Work Sum Rule for Open Quantum Systems
• Detecting heat leaks with trapped ion qubits
• Making the Virtual Real: Measurement-Powered Tunneling Engines
• Separating a particle's mass from its momentum
• Detection of a semitransparent object with no exchange of quanta
• Theory of coherent interaction-free detection of pulses
• On the energetic analysis of autonomous quantum systems
• Thermodynamics of a Quantum Subsystem