Exponential suppression of bit-flips in a qubit encoded in an oscillator
- R. Lescanne, M. Villiers, Z. Leghtas
- PhysicsNature Physics
- 26 July 2019
A quantum system interacts with its environment—if ever so slightly—no matter how much care is put into isolating it 1 . Therefore, quantum bits undergo errors, putting dauntingly difficult…
A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9%
- J. Yoneda, K. Takeda, S. Tarucha
- PhysicsNature Nanotechnology
- 1 February 2018
It is revealed that the free-evolution dephasing is caused by charge noise—rather than conventional magnetic noise—as highlighted by a 1/f spectrum extended over seven decades of frequency, offering a promising route to large-scale spin-qubit systems with fault-tolerant controllability.
A>99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
- J. Yoneda, K. Takeda, S. Tarucha
- Physics
- 4 August 2017
1 RIKEN Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 2 Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan 3 JST, PRESTO, 4-1-8 Honcho,…
A fault-tolerant addressable spin qubit in a natural silicon quantum dot
- K. Takeda, J. Kamioka, S. Tarucha
- PhysicsScience Advances
- 25 February 2016
This is the first experimental demonstration of a fault-tolerant spin qubit in industry-compatible isotopically natural silicon using a natural silicon double quantum dot with a micromagnet that is optimally designed for fast spin control.
Coupling a quantum dot, fermionic leads, and a microwave cavity on a chip.
- M. Delbecq, V. Schmitt, T. Kontos
- PhysicsPhysical Review Letters
- 22 August 2011
A hybrid architecture consisting of a quantum dot circuit coupled to a single mode of the electromagnetic field is demonstrated and an electron-photon coupling strength is determined which should enable circuit QED experiments with more complex quantum dot circuits.
Out-of-equilibrium charge dynamics in a hybrid circuit quantum electrodynamics architecture
- J. Viennot, M. Delbecq, M. Dartiailh, A. Cottet, T. Kontos
- Physics
- 16 October 2013
(Dated: December 23, 2013)The recent development of hybrid cQED allows one to study how cavity photons interact witha system driven out of equilibrium by fermionic reservoirs. We study here one of…
Synthetic spin–orbit interaction for Majorana devices
- M. Desjardins, L. Contamin, T. Kontos
- PhysicsNature Materials
- 20 February 2019
It is shown that coupling to a magnetic texture can induce both a strong spin–orbit coupling of 1.1 meV and a Zeeman effect in a carbon nanotube and signatures of Majorana zero modes—promising for quantum computing applications—are observed.
Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array.
- T. Nakajima, M. Delbecq, S. Tarucha
- PhysicsPhysical Review Letters
- 13 January 2017
A new method for projective single-shot measurement of two electron spin states (singlet versus triplet) in an array of gate-defined lateral quantum dots in GaAs that exploits a long-lived metastable charge state, which increases both the contrast and the duration of the charge signal distinguishing the two measurement outcomes.
Single-electron Spin Resonance in a Quadruple Quantum Dot
- T. Otsuka, T. Nakajima, S. Tarucha
- PhysicsScientific Reports
- 9 October 2015
Here, single-electron spin resonance in a quadruple quantum dot is demonstrated and frequency-resolved addressable control of each electron spin resonance is possible.
Amplified and tunable transverse and longitudinal spin-photon coupling in hybrid circuit-QED
- Neill Lambert, M. Cirio, F. Nori
- Physics
- 6 December 2017
We describe a method to tune, in-situ, between transverse and longitudinal light-matter coupling in a hybrid circuit-QED device composed of an electron spin degree of freedom coupled to a microwave…
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