World record for squeezing in a hot atomic vapor

We have recently updated our four-wave-mixing (FWM) experimental setup with new photodiodes in order to improve the quantum efficiency (QE).
A special batch of diodes from Hamamatsu has been used, with an AR coating at 795 nm.
The QE is now above 99% and we have improved previous measurement of squeezing by a few dB.
The current record in the lab is -10.6 dB at 500 kHz, only corrected by the electronic noise floor of the detection circuitry.


10dB