169 citations · 514 across the 11 of their papers we have counts for
11 papers
On the energy barrier of hypergraph product codes
Guangqi Zhao, Andrew C. Doherty, Isaac H. Kim
A macroscopic energy barrier is a necessary condition for self-correcting quantum memory. In this paper, we prove tight bounds on the energy barrier applicable to any quantum code…
On-Chip Microwave Quantum Hall Circulator
A. C. Mahoney, J. I. Colless, S. J. Pauka +6
Circulators are non-reciprocal circuit elements integral to technologies including radar systems, microwave communication transceivers, and the readout of quantum information devic…
Mechanical Entanglement via Detuned Parametric Amplification
Alex Szorkovszky, Aashish A. Clerk, Andrew C. Doherty +1
We propose two schemes to generate entanglement between a pair of mechanical oscillators using parametric amplification. In contrast to existing parametric drive-based protocols, b…
Detuned Mechanical Parametric Amplification as a Quantum Non-Demolition Measurement
Alex Szorkovszky, Aashish A. Clerk, Andrew C. Doherty +1
Recently it has been demonstrated that the combination of weak-continuous position detection with detuned parametric driving can lead to significant steady-state mechanical squeezi…
Superconducting qubit as a probe of quantum fluctuations in a nonlinear resonator
Maxime Boissonneault, A. C. Doherty, F. R. Ong +4
In addition to their central role in quantum information processing, qubits have proven to be useful tools in a range of other applications such as enhanced quantum sensing and as…
Stimulated Phonon Emission in a Driven Double Quantum Dot
J. I. Colless, X. G. Croot, T. M. Stace +5
The compound semiconductor gallium arsenide (GaAs) provides an ultra-clean platform for storing and manipulating quantum information, encoded in the charge or spin states of electr…
Strong thermomechanical squeezing via weak measurement
Alex Szorkovszky, George A. Brawley, Andrew C. Doherty +1
We experimentally surpass the 3dB limit to steady state parametric squeezing of a mechanical oscillator. The localization of a AFM cantilever, achieved by optimal estimation, is en…
Position Estimation of a Parametrically Driven Optomechanical System
Alex Szorkovszky, Andrew C. Doherty, Glen I. Harris +1
We study the position estimation of a mechanical oscillator undergoing both detuned parametric amplification and continuous quantum measurement. This model, which can be utilised t…
Circuit quantum electrodynamics with a nonlinear resonator
P. Bertet, F. R. Ong, M. Boissonneault +6
One of the most studied model systems in quantum optics is a two-level atom strongly coupled to a single mode of the electromagnetic field stored in a cavity, a research field name…
Backaction of a driven nonlinear resonator on a superconducting qubit
Maxime Boissonneault, A. C. Doherty, F. R. Ong +4
We study the backaction of a driven nonlinear resonator on a multi-level superconducting qubit. Using unitary transformations on the multi-level Jaynes-Cummings Hamiltonian and qua…
Mechanical squeezing via parametric amplification and weak measurement
Alex Szorkovszky, Andrew C. Doherty, Glen I. Harris +1
Nonlinear forces allow motion of a mechanical oscillator to be squeezed below the zero-point motion. Of existing methods, mechanical parametric amplification is relatively accessib…