December 14th, 2020 | by admin | published in Featured, Highlights, Papers, Quantum Computing, Research
Universal Nonadiabatic Control of Small-Gap Superconducting Qubits Daniel L. Campbell, Yun-Pil Shim, Bharath Kannan, Roni Winik, David K. Kim, Alexander Melville, Bethany M. Niedzielski, Jonilyn L. Yoder, Charles Tahan, Simon Gustavsson, and William D. Oliver Phys. Rev. X 10, 041051 – Published 14 December 2020 ABSTRACT Resonant transverse driving of a two-level system as viewed in […]
October 3rd, 2020 | by admin | published in Highlights, Preprints, Research
Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity Rusko Ruskov, Charles Tahan We propose entangling operations based on the energy curvature couplings of encoded spin qubits to a superconducting cavity, exploring the non-linear qubit response to a gate voltage variation. For a two-qubit (n-qubit) entangling gate we explore acquired geometric phases […]
October 2nd, 2019 | by admin | published in Highlights, Preprints, Quantum Computing, Research
In a collaboration with MIT we develop a roadmap for exploring new physics in arrays of superconducting qubits.
July 21st, 2019 | by admin | published in Featured, Highlights, Papers, Quantum Computing, Research
We revisit quantum capacitance from first principles to understand its potential for quantum-limited readout. We show that the readout speed can be unexpectedly fast with high kinetic inductance cavities while the qubit remains in a particularly immune state to noise.
May 4th, 2019 | by admin | published in Featured, Highlights, Nanotechnology, Quantum Computing, Research
Proposed probe chip a potential shortcut for quantum device manufacturing cycle
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 […]
July 20th, 2016 | by admin | published in Featured, Highlights, Quantum Computing, Research
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.
March 19th, 2016 | by admin | published in Featured, Quantum Computing, Research
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. […]
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 […]