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Joe Schindler: on 6/21/21 at 1:03am UTC, wrote ABSTRACT: Counting the number of photons in an electromagnetic mode is...


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September 26, 2021

CATEGORY: Blog [back]
TOPIC: Measuring the number of photons in a microwave mode by Benjamin Huard [refresh]
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FQXi Administrator Joe Schindler wrote on Jun. 21, 2021 @ 01:03 GMT
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



Keywords: #quantum #measurement #IAF

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