Verfahren und Einheit zur Charakterisierung oder Steuerung eines Quantensystems

Details

Veröffentlichungs-Nr.

EP4787247

Anmeldetag

31. Januar 2025

Veröffentlichung

5. August 2026

Rechtsraum

EP

IPC

G06N10/40, G06N10/70

Abstract

A method of characterizing or controlling a quantum system (1), wherein the dynamics of the quantum system is describable via a stochastic master equation having a plurality of physical parameters, and wherein the quantum system comprises: (i) one or more quantum-state-hosting structure(s) (6); (ii) a detector (8) coupled to at least one of the quantum-state-hosting structure(s) (6) and configured to measure a continuous signal output from the quantum-state-hosting structure(s) (6) to provide a measurement signal from the quantum system (1), wherein the detector (8) is configured to digitize the continuous signal over time bins of duration Δt; and (iii) one or more signal generator(s) (11,13) coupled to the at least one portion and configured to input control signal(s) to physically control the dynamics of the quantum system. The method comprises: (I) physically measuring, with the detector, a continuous signal from the quantum system to provide a plurality of digitized discrete-time binned signals {I1 , ... , Ik} up to time t = kΔt, wherein k is an integer denoting the k-th time bin of the detector; (II) computing a binned state of the quantum system at time t = kΔt, ρk =E ρ k Δ t I 1 , … , I k <img class="EMIRef" id="a3ed2f85-c5f5-464f-b330-0908b35248cb-ia01" /> , wherein the binned state ρk is the average of a plurality of solutions ρkΔt of the stochastic master equation at time t = kΔt each for different possible continuous signals wherein, for each of the plurality of solutions ρkΔt , the value of the possible continuous signal integrated over a given time bin is substantially equal to the discrete-time binned signal for said given time bin; and (III) using the binned state ρk to: assign a value to at least one of the plurality of physical parameters which characterizes the quantum system; and/or assign a value to at least one of the plurality of physical parameters which parametrizes the input control signal(s) to physically control the dynamics of the quantum system; and/or optimize a readout discriminator of a quantum state readout protocol. There is provided a quantum characterisation or control unit, a computer program product, and a computer-readable medium.

Anmelder

Firmen

Alice & Bob
Ecole Nationale Superieure des Mines de Paris

Land

🇫🇷 Frankreich

Fachgebiete