Quantencomputer und Verfahren zur Destillation Magischer Zustände

Details

Veröffentlichungs-Nr.

EP4811226

Anmeldetag

21. März 2025

Veröffentlichung

23. September 2026

Rechtsraum

EP

IPC

G06N10/70, G06N10/20

Abstract

There is provided a method for distilling a magic state implemented by a quantum computer comprising a plurality of physical data cat qubits using an outer code, wherein the magic state is for a jπ/4 rotation about the Pauli X- or Z-axis where j is an integer selected from j ∈ {1,2,3,5,6,7}. The method comprises: (i) encoding three or more validation logical qubits with at least some of the data cat qubits using one or more classical phase-flip error-correcting code(s); (ii) encoding one or more output logical qubit(s) with at least some of the data cat qubits using one or more error-correcting code(s); (iii) preparing one or more distilled magic state(s) with the validation logical qubits and the one or more output logical qubit(s) using the outer code to respectively host each of the distilled magic state(s) in a different one of the output logical qubit(s), wherein the outer code is configured to have a logical gate corresponding to the jπ/4 rotation and/or -jπ/4 rotation which is transversal. Using the outer code comprises: (a) performing, for each of the validation logical qubits and output logical qubit(s), at least one single Pauli rotation or Pauli product rotation involving said logical qubit, wherein the rotation is a jπ4+l∗j∗π22π rotation with l being an integer, wherein each rotation is performed via: (I) gate teleportation of an initial magic state using a first injection logical qubit, the first injection logical qubit being encoded with at least some of the data cat qubits using a phase-flip repetition code; or (II) physically applying a single qubit gate corresponding to the jπ4+l∗j∗π22π rotation to one data cat qubit which simultaneously forms the logical X support for one or more of the validation and/or output logical qubit(s); and (b) performing a logical Z or X measurement on each of the validation logical qubits, and depending on the results of the logical measurements either: (I) repeating operations (i)-(iii); or (II) terminating the distilling and utilizing the distilled magic state(s). There is also provided a quantum computer comprising: a plurality of physical resonators; and a command circuit for sending control signals to the physical resonators to stabilize a plurality of physical data cat qubits; wherein the command circuit is further configured to perform the method of distilling the magic state.

Anmelder

Firmen

Alice & Bob
INRIA - Institut National de Recherche en Informatique et en Automatique

Land

🇫🇷 Frankreich

Fachgebiete