| Full text | |
| Author(s): |
Poulsen, Kasper
;
Santos, Alan C.
;
Zinner, Nikolaj T.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Physical Review Letters; v. 128, n. 24, p. 6-pg., 2022-06-13. |
| Abstract | |
We propose a quantum Wheatstone bridge as a fully quantum analog to the classical version. The bridge is a few-body boundary-driven spin chain exploiting quantum effects to gain an enhanced sensitivity to an unknown coupling. The sensitivity is explained by a drop in population of an entangled Bell state due to destructive interference as the controllable coupling approaches the unknown coupling. A simple criterion for the destructive interference is found, and an approximate expression for the width of the drop is derived. The sensitivity to the unknown coupling is quantified using the quantum Fisher information, and we show that the state of the bridge can be measured indirectly through the spin current. Our results are robust toward calibration errors and generic in the sense that several of the current state-of-the-art quantum platforms could be used as a means of realization. The quantum Wheatstone bridge may thus find use in fields such as sensing and metrology using near-term quantum devices. (AU) | |
| FAPESP's process: | 21/10224-0 - Quantum information processing with trapped Rydberg ions |
| Grantee: | Alan Costa dos Santos |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 19/22685-1 - Memory effect and the transition from weak to strong disorder |
| Grantee: | Alan Costa dos Santos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |