Reducing collective quantum state rotation errors with reversible dephasing
Abstract
We demonstrate that reversible dephasing via inhomogeneous broadening can greatly reduce collective quantum state rotation errors, and observe the suppression of rotation errors by more than 21 dB in the context of collective population measurements of the spin states of an ensemble of 2.1×105 laser cooled and trapped 87Rb atoms. The large reduction in rotation noise enables direct resolution of spin state populations 13(1) dB below the fundamental quantum projection noise limit. Further, the spin state measurement projects the system into an entangled state with 9.5(5) dB of directly observed spectroscopic enhancement (squeezing) relative to the standard quantum limit, whereas no enhancement would have been obtained without the suppression of rotation errors.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 29, 2014
- Source ID
- 10.1063/1.4905148
Entities
People
- James K Thompson
- Joshua M. Weiner
- Justin Bohnet
- Kevin C. Cox
- Matthew A Norcia
Organizations
- National Institute of Standards and Technology
- National Science Foundation
- University of Colorado