April 14th, 2019 | by admin | published in Featured, Highlights, News, Quantum Computing, Research
Why is it better to operate exchange gates by tuning the tunnel gate instead of doing detuning? This paper shows, quantitately, that tunnel gates inflict less susceptibility to charge noise. So if you are making a quantum dot quantum computer, make sure your fast lines are on the barrier gates! We present a theory for understanding […]
April 14th, 2019 | by admin | published in News, Papers, Quantum Computing, Research
We explain an unexpected anomoly of the g-factor (how the electron spin qubit energy changes as a function of magnetic field) in silicon quantum dots. This new mechanism creates a new channel for decoherence (via electrical noise and spin-orbit coupling), which – we predict can be negated by changing the direction of the magnetic field. This […]
March 16th, 2016 | by admin | published in Highlights, News, Papers, Quantum Computing
Superconducting circuits offer tremendous design flexibility in the quantum regime culminating most recently in the demonstration of few qubit systems supposedly approaching the threshold for fault-tolerant quantum information processing. Competition in the solid-state comes from semiconductor qubits, where nature has bestowed some very useful properties which can be utilized for spin qubit-based quantum computing. Here […]
January 31st, 2016 | by admin | published in News, Preprints, Quantum Computing
We introduce an always-on, exchange-only qubit made up of three localized semiconductor spins that offers a true “sweet spot” to fluctuations of the quantum dot energy levels. Both single- and two-qubit gate operations can be performed using only exchange pulses while maintaining this sweet spot. We show how to interconvert this qubit to other three-spin […]
November 5th, 2015 | by admin | published in News, Papers, Quantum Computing
Spin qubits composed of either one or three electrons are realized in a quantum dot formed at a Si/SiO_2-interface in isotopically enriched silicon. Using pulsed electron spin resonance, we perform coherent control of both types of qubits, addressing them via an electric field dependent g-factor. We perform randomized benchmarking and find that both qubits can […]
October 6th, 2015 | by admin | published in News, People
Congratulations to all the new APS Fellows nominated by GQI.
July 28th, 2015 | by admin | published in News, Preprints
Superconducting circuits offer tremendous design flexibility in the quantum regime culminating most recently in the demonstration of few qubit systems supposedly approaching the threshold for fault-tolerant quantum information processing. Competition in the solid-state comes from semiconductor qubits, where nature has bestowed some almost magical and very useful properties which can be utilized for spin qubit […]
February 28th, 2015 | by admin | published in News, Talks
See all our great talks at MM2015 in San Antonio!
January 16th, 2015 | by admin | published in Highlights, News
We were asked to write a perspective for the Per Delsing group’s recent publication in Science: Catching the quantum sound wave Here’s the corresponding article: Propagating phonons coupled to an artificial atom
August 10th, 2014 | by admin | published in News, Preprints
How to build advanced superconducting quantum devices in silicon, germanium, or diamond!