Southwest Quantum Information and Technology

Single mode squeezers for enhancement of transmission estimation with macroscopic quantum states

Presenting Author: Timothy Woodworth, University of Oklahoma
Contributing Author(s): Alberto M. Marino

Transmission estimation is at the heart of a number of techniques such as spectroscopy, calibration of optical elements and efficiency of detectors; can be used to set bounds on quantum interferometry and quantum key distribution; and serves as the estimation parameter for sensors such as resonance or plasmonic sensors. We have previously shown that displaced squeezed states, such as the bright two mode squeezed state (bTMSS) and bright single mode squeezed state (bSMSS), can approach the ultimate sensitivity per photon for transmission estimation given by the quantum Fisher information (QFI), while operating with a number of photons many orders of magnitude larger than the optimal states. Here, we study the effect on the QFI of additional squeezers before and after the system under study. We compare the addition of a single mode squeezer in the path of the optical beam probing the system when using a bSMSS or a bTMSS. As expected, we find that with the additional squeezer the bSMSS has a higher QFI than the bTMSS. However, when classical noise is introduced, we find that the bTMSS is more robust than the bSMSS and can therefore achieve a higher QFI. Additionally, as has been previously shown, the negative effects of imperfect detection can be greatly reduced through the use of a single mode squeezer to anti-squeeze the amplitude quadrature after the probed system.

(Session 5 : Thursday from 12:00pm-2:00 pm)