Abstract
We analyze theoretically and experimentally cases of asymmetric detection, stimulation, and loss within a quantum nonlinear interferometer of entangled pairs. We show that the visibility of the SU(1,1) interference directly discerns between loss on the measured mode (signal) and the conjugated mode (idler). This asymmetry also affects the phase sensitivity of the interferometer, where coherent seeding is shown to mitigate losses that are suffered by the conjugated mode; therefore increasing the maximum threshold of loss that permits sub-shot-noise phase detection. Our findings can improve the performance of setups that rely on direct detection of entangled pairs, such as quantum interferometry and imaging with undetected photons.
Original language | English |
---|---|
Article number | 173603 |
Journal | Physical Review Letters |
Volume | 127 |
Issue number | 17 |
DOIs | |
State | Published - 22 Oct 2021 |
Bibliographical note
Publisher Copyright:© 2021 American Physical Society
Funding
Israel Innovation authority Israeli Council of Higher Education Foundational Questions Institute PAZY Foundation We thank Yuri Kaganovskii and Joseph Kantorovitsch for producing the variable filters and providing major insight. E. C. and A. P. were supported by the Israel Innovation authority under Grants No. 7002 and No. 73795. E. C. acknowledges support from the Quantum Science and Technology Program of the Israeli Council of Higher Education, from FQXi, and from the Pazy foundation.
Funders | Funder number |
---|---|
Israel Innovation authority Israeli Council of Higher Education Foundational Questions Institute | |
Quantum Science and Technology Program of the Israeli Council of Higher Education | |
PAZY Foundation |