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Fast spin exchange between two distant quantum dots
Filip K. Malinowski, Frederico Martins, Thomas B. Smith +8
The Heisenberg exchange interaction between neighboring quantum dots allows precise voltage control over spin dynamics, due to the ability to precisely control the overlap of orbit…
Spin of a multielectron quantum dot and its interaction with a neighboring electron
Filip K. Malinowski, Frederico Martins, Thomas B. Smith +8
We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron doubl…
Long-range entanglement for spin qubits via quantum Hall edge modes
Samuel J. Elman, Stephen D. Bartlett, Andrew C. Doherty
We propose and analyse a scheme for performing a long-range entangling gate for qubits encoded in electron spins trapped in semiconductor quantum dots. Our coupling makes use of an…
Characterisation of an exchange-based two-qubit gate for resonant exchange qubits
Matthew P. Wardrop, Andrew C. Doherty
Resonant exchange qubits are a promising addition to the family of experimentally implemented encodings of single qubits using semiconductor quantum dots. We have shown previously…
Suppressing qubit dephasing using real-time Hamiltonian estimation
Michael D. Shulman, Shannon P. Harvey, John M. Nichol +4
Unwanted interaction between a quantum system and its fluctuating environment leads to decoherence and is the primary obstacle to establishing a scalable quantum information proces…
Exchange-based two-qubit gate for singlet-triplet qubits
Matthew P. Wardrop, Andrew C. Doherty
We analyse a simple exchange-based two-qubit gate for singlet-triplet qubits in gate-defined semiconductor quantum dots that can be implemented in a single exchange pulse. Excitati…
Two-Qubit Gates for Resonant Exchange Qubits
Andrew C. Doherty, Matthew P. Wardrop
A new approach to single-qubit operations using exchange interactions of single electrons in gate-defined quantum dots has recently been demonstrated: the resonant exchange qubit.…
Self-Consistent Measurement and State Tomography of an Exchange-Only Spin Qubit
J. Medford, J. Beil, J. M. Taylor +7
We report initialization, complete electrical control, and single-shot readout of an exchange-only spin qubit. Full control via the exchange interaction is fast, yielding a demonst…
Dispersive Readout of a Few-Electron Double Quantum Dot with Fast rf Gate-Sensors
J. I. Colless, A. C. Mahoney, J. M. Hornibrook +4
We report the dispersive charge-state readout of a double quantum dot in the few-electron regime using the in situ gate electrodes as sensitive detectors. We benchmark this gate-se…
Circuit QED with a Nonlinear Resonator : ac-Stark Shift and Dephasing
F. R. Ong, M. Boissonneault, F. Mallet +7
We have performed spectroscopic measurements of a superconducting qubit dispersively coupled to a nonlinear resonator driven by a pump microwave field. Measurements of the qubit fr…
Entangling a nanomechanical resonator and a superconducting microwave cavity
D. Vitali, P. Tombesi, M. J. Woolley +2
We propose a scheme able to entangle at the steady state a nanomechanical resonator with a microwave cavity mode of a driven superconducting coplanar waveguide. The nanomechanical…
Population inversion of driven two-level systems in a structureless bath
T. M. Stace, A. C. Doherty, S. D. Barrett
We derive a master equation for a driven double-dot damped by an unstructured phonon bath, and calculate the spectral density. We find that bath mediated photon absorption is impor…
A Quantum Non-demolition measurement of Fock states of mesoscopic mechanical oscillators
D. H. Santamore, A. C. Doherty, M. C. Cross
We investigate a scheme that makes a quantum non-demolition measurement of the excitation level of a mesoscopic mechanical oscillator by utilizing the anharmonic coupling between t…