Phase sensitivity of gain-unbalanced nonlinear interferometers
arXiv:1711.06226 · doi:10.1103/PhysRevA.96.053863
Abstract
The phase uncertainty of an unseeded nonlinear interferometer, where the output of one nonlinear crystal is transmitted to the input of a second crystal that analyzes it, is commonly said to be below the shot-noise level but highly dependent on detection and internal loss. Unbalancing the gains of the first (source) and second (analyzer) crystals leads to a configuration that is tolerant against detection loss. However, in terms of sensitivity, there is no advantage in choosing a stronger analyzer over a stronger source, and hence the comparison to a shot-noise level is not straightforward. Internal loss breaks this symmetry and shows that it is crucial whether the source or analyzer is dominating. Based on these results, claiming a Heisenberg scaling of the sensitivity is more subtle than in a balanced setup.
11 pages, 4 figures, 1 table
References in corpus (6)
- Mach-Zehnder Interferometry at the Heisenberg Limit with coherent and squeezed-vacuum light
- Detection loss tolerant supersensitive phase measurement with an SU(1,1) interferometer
- Improving the phase super-sensitivity of squeezing-assisted interferometers by squeeze factor unbalancing
- Quantum correlations in optical metrology: Heisenberg-limited phase estimation without mode entanglement
- Engineering the Frequency Spectrum of Bright Squeezed Vacuum via Group Velocity Dispersion in an SU(1,1) Interferometer
- Controlling induced coherence for quantum imaging