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The Heisenberg limit for laser coherence

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Date and time Jul 27, 2020
from 05:00 PM to 06:00 PM
Location Zoom meeting
Host Aephraim Steinberg

Howard Wiseman

Centre for Quantum Dynamics, Griffith University, Australia

Abstract

To quantify quantum optical coherence requires both the particle- and wave-natures of light. For an ideal laser, it can be thought of as the number of photons emitted into the beam with the same phase. This number, C, for an ideal laser was thought to be on the order of the square of the photon number in the laser itself, O(μ2). Here, assuming nothing about the laser operation except that its inputs are incoherent, but making some assumptions on the ideality of the laser beam, we find the ultimate (Heisenberg) limit: C = O(μ4). Moreover, we find a laser model that can achieve this scaling, and show that, in principle, it could be realised with familiar physical couplings. 
 
Join Zoom meeting:
https://zoom.us/j/94243071494?pwd=VHpCVk0rci9McEVETlpGNUszTUdDUT09
 
Meeting ID 942 4307 1494
Password  487616
 
LInk to the video recording of the meeting: https://play.library.utoronto.ca/abf9375926cdf791601e09087fcf7320
 
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