Interaction-Free Measurements with Superconducting Qubits
Abstract
An interaction-free measurement protocol is described for a quantum circuit consisting of a superconducting qubit and a readout Josephson junction. By measuring the state of the qubit, one can ascertain the presence of a current pulse through the circuit at a previous time without any energy exchange between the qubit and the pulse.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2006
- DOI:
- 10.1103/PhysRevLett.97.180406
- arXiv:
- arXiv:0804.0523
- Bibcode:
- 2006PhRvL..97r0406P
- Keywords:
-
- 03.65.Ta;
- 73.23.Hk;
- 85.25.Cp;
- Foundations of quantum mechanics;
- measurement theory;
- Coulomb blockade;
- single-electron tunneling;
- Josephson devices;
- Condensed Matter - Superconductivity;
- Quantum Physics
- E-Print:
- 4 pages, 2 figures