[astroseminar at Sapienza] today at 16:00: Phil Mauskopf

[Elia Battistelli]

Title: Beyond the standard quantum limit: applications of single photon 
counting detectors for axion detection, intensity interferometry and 
interstellar communications
Speaker:   Phil Mauskopf
Institution: Arizona State University
Date: Thursday Oct 3, 2024
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract: The standard quantum limit for sensing is related to the 
quantum noise from coherent detection of two conjugate quantities such 
as amplitude and phase. One way to beat this limit is with a technique 
called squeezing which increases the uncertainty along one axis in 
exchange for reducing it along the complementary axis. Another way to 
beat the limit is to use incoherent detection which is essentially phase 
insensitive. In the limit of low photon occupation number, single photon 
detection can achieve much better sensitivity than the standard quantum 
limit. I will describe several applications of single photon detection 
and the associated technology development including: i) microwave single 
photon counting detectors for axion searches, ii) single photon counting 
intensity interferometry with small telescopes and iii) deep space and 
interstellar optical communication.

web: https://agenda.infn.it/event/43487/