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Microwave-free, high-fidelity, hot superconducting qubits

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 […]


Connecting spin qubits fast via longitudinal coupling

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 […]


Realizing the two-dimensional hard-core Bose-Hubbard model with superconducting qubits

In a collaboration with MIT we develop a roadmap for exploring new physics in arrays of superconducting qubits.


Quantum-limited measurement of spin qubits via curvature coupling to a cavity

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.


Induced quantum dot probe for material characterization

Proposed probe chip a potential shortcut for quantum device manufacturing cycle


Theory of barrier vs tilt exchange gate operations in spin-based quantum computing

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 […]


PRB: Electron g-factor of valley states in realistic silicon quantum dots

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 […]


Always-on Exchange-ONly (AEON) spin-based qubits

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.


Semiconductor-inspired superconducting 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. […]


Nature Communications: Semiconductor-inspired design principles for superconducting 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 […]


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