Online Seminar: Prof Benjamin Huard, ENS Lyon

Improving photon number measurements using multiplexing or quantum memory.

yellow and orange light in horizonal rays with abstract ruler in background

The evolution of quantum systems under measurement is a central aspect of
quantum mechanics. arXiv:2001.03217 [quant-ph]
Image: WallpaperCave

Measuring the number of photons in a microwave mode

SPEAKER: Professor Benjamin Huard

AFFILIATION: Lyon Higher Normal School (ENS de Lyon), Lyon University, Lyon, France 

HOSTED BY: A/Prof Nathan Langford, UTS Centre for Quantum Software and Information

ABSTRACT: 
Counting the number of photons in an electromagnetic mode is an important tool for quantum information processing. In order to perform a single shot measurement, one usually encodes information about the photon number into a qubit state and read out the qubit. Repeating this procedure while varying the encoded single bit of information enables to pinpoint the number of photons. In this talk, I will present two experiments that address two main challenges in photocounting.

First, I will show how one can avoid the sequential repetition of qubit measurements and instead use a single superconducting qubit in order to multiplex the measurement of the photon number in a stationary microwave mode.

Second, I will show how we could convert a stationary mode counter into a photocounter of traveling wave packets using a quantum memory.

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