no code implementations • 12 Feb 2021 • Kazuhisa Ogawa, Natsuki Abe, Hirokazu Kobayashi, Akihisa Tomita
The variance of an observable for a preselected quantum system, which is always real and non-negative, appears in the increase of the probe wave packet width in indirect measurement.
Quantum Physics
no code implementations • 11 Apr 2018 • Kosuke Fukui, Akihisa Tomita, Atsushi Okamoto
In the proposed method, the analog quantum error correction is utilized to make the performances of the single-qubit level quantum error correction almost identical to those of the logical-qubit level quantum error correction in a practical noise level.
Quantum Physics
no code implementations • 1 Dec 2017 • Kosuke Fukui, Akihisa Tomita, Atsushi Okamoto, Keisuke Fujii
To reduce this requirement, we propose a high-threshold fault-tolerant quantum computation with GKP qubits using topologically protected measurement-based quantum computation with the surface code.
Quantum Physics
no code implementations • 9 Jun 2017 • Kosuke Fukui, Akihisa Tomita, Atsushi Okamoto
To implement fault-tolerant quantum computation with continuous variables, Gottesman-Kitaev-Preskill (GKP) qubits have been recognized as an important technological element.
Quantum Physics