dc.creator | Michael, Ernest | |
dc.creator | Besser, Felipe | |
dc.date.accessioned | 2019-05-31T15:19:52Z | |
dc.date.available | 2019-05-31T15:19:52Z | |
dc.date.created | 2019-05-31T15:19:52Z | |
dc.date.issued | 2018 | |
dc.identifier | IEEE Access, Volumen 6, 2018, Pages 45299 - 45316 | |
dc.identifier | 21693536 | |
dc.identifier | 10.1109/ACCESS.2018.2855405 | |
dc.identifier | https://repositorio.uchile.cl/handle/2250/169385 | |
dc.description.abstract | The cross-correlation sensitivity of two identical balanced photodiode heterodyne receivers
is characterized. Both the balanced photodiodes receive the same weak signal split up equally, a situation
equivalent to an astronomical spatial interferometer. A common local oscillator is also split up equally and its
phase difference between both the receivers is stabilized. We show by a semi-classical photon deletion theory
that the post-detection laser shot noise contributions on both the receivers must be completely uncorrelated
in this case of passing three power splitters. We measured the auto- and cross-correlation outputs as a
function of the weak signal power (system noise temperature measurement) and obtained a cross-correlation
system noise temperature up to 20 times lower than for the auto-correlation system noise temperature of
each receiver separately. This is supported by Allan plot measurements showing cross-correlation standard
deviations 30 times lower than in auto-correlation. Careful calibration of the source power shows that
the auto-correlation (regular) noise temperature of the single balanced receivers is already very near to
the quantum limit as expected, which suggests a cross-correlation system noise temperature below the
quantum limit. If validated further, this experimentally clear finding will not only be relevant for astronomical
instrumentation but also for other fields, such as telecommunications and medical imaging. | |
dc.language | en | |
dc.publisher | Institute of Electrical and Electronics Engineers Inc. | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Chile | |
dc.source | IEEE Access | |
dc.subject | auto-correlation | |
dc.subject | balanced receiver | |
dc.subject | cross-correlation | |
dc.subject | Heterodyne receiver | |
dc.subject | noise cancellation | |
dc.subject | noise temperature | |
dc.subject | quantum limit | |
dc.title | On the possibility of breaking the heterodyne detection quantum noise limit with cross-correlation | |
dc.type | Artículo de revista | |