Improving photon number measurements using multiplexing or quantum memory.
TITLE: 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.
RELATED PAPERS
[1] Multiplexed photon number measurement A. Essig, Q. Ficheux, T. Peronnin, N. Cottet, R. Lescanne, A. Sarlette, P. Rouchon, Z. Leghtas, B. Huard https://arxiv.org/abs/2001.03217
[2] Number-resolved photocounter for propagating microwave mode R. Dassonneville, R. Assouly, T. Peronnin, P. Rouchon, B. Huard https://arxiv.org/abs/2004.05114
OTHER LINKS
Quantum Circuit Group, Ecole Normale Supérieure de Lyon
https://www.physinfo.fr/
Associate Professor Nathan Langford. https://www.uts.edu.au/staff/nathan.langford
UTS Centre for Quantum Software and Information. https://www.uts.edu.au/research-and-teaching/our-research/centre-quantum-software-and-information
