Coherent interaction-free detection of microwave pulses with a superconducting circuit
arXiv:2204.01657 · doi:10.1038/s41467-022-35049-z
Abstract
The interaction-free measurement is a fundamental quantum effect whereby the presence of a photosensitive object is determined without irreversible photon absorption. Here we propose the concept of coherent interaction-free detection and demonstrate it experimentally using a three-level superconducting transmon circuit. In contrast to standard interaction-free measurement setups, where the dynamics involves a series of projection operations, our protocol employs a fully coherent evolution that results, surprisingly, in a higher probability of success. We show that it is possible to ascertain the presence of a microwave pulse resonant with the second transition of the transmon, while at the same time avoid exciting the device onto the third level. Experimentally, this is done by using a series of Ramsey microwave pulses coupled into the first transition and monitoring the ground-state population.
24 pages, 20 figures. Comments are welcome!
References in corpus (14)
- Charge insensitive qubit design derived from the Cooper pair box
- Quantum Illumination with Gaussian States
- Quantum back-action of variable-strength measurement
- Low-decoherence flux qubit
- Protocol for direct counterfactual quantum communication
- Dynamics of simultaneously measured non-commuting observables
- Interaction-free measurements with superconducting qubits
- On-chip interaction-free measurements via the quantum Zeno effect
- Generalized partial measurements
- A quantum no-reflection theorem and the speeding up of Grover's search algorithm
- Partial measurements and the realization of quantum-mechanical counterfactuals
- Coherent interaction-free detection of microwave pulses with a superconducting circuit
- Non-invasive measurement of currents in analog quantum simulators
- Protocol for temperature sensing using a three-level transmon circuit