Beating shot noise using multi-port interferometers
Abstract
The goal of CoBoSaMe is to study the potential of tuneable multiport interferometers for quantum metrology and quantum sensing. It is nowadays possible to build large integrated optical circuits with tunable beam splitters and phase shifters. These circuits can implement arbitrary unitary transformations on light and, when operated with highly attenuated light, the outgoing photon statistics of the circuit becomes computationally hard to estimate and reproduce ---this is known as the boson-sampling problem---. CoBoSaMe’s premise is that the hardness of boson-sampling implies that random optical circuits must be highly sensitive to changes of their parameters. Based on this, CoBoSaMe introduces a new interferometer design that combines a random multiport optical circuit with the medium to be sensed and applies a set of correlated measurements that reveal changes in the photon statistics. Using multiparameter quantum sensing ideas, these changes can be simultaneously used to detect intrinsic errors in the circuit (losses and decoherence) together with the measured signal with a better than classical uncertainty.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 11, 2018
- Source ID
- FA23861814019
Entities
People
- Juan José García-Ripoll
Organizations
- Air Force Office of Scientific Research
- Spanish National Research Council
- United States Air Force