1.6k citations · 10.5k across the 95 of their papers we have counts for
13 papers · 1 filter
Symmetric extension in two-way quantum key distribution
Geir Ove Myhr, Joseph M. Renes, Andrew C. Doherty +1
We introduce symmetric extensions of bipartite quantum states as a tool for analyzing protocols that distill secret key from quantum correlations. Whether the correlations are comi…
First order phase transition in the anisotropic quantum orbital compass model
Roman Orus, Andrew C. Doherty, Guifre Vidal
We investigate the anisotropic quantum orbital compass model on an infinite square lattice by means of the infinite projected entangled-pair state algorithm. For varying values of…
Quantum Control via Geometry: An explicit example
Mile Gu, Andrew Doherty, Michael Nielsen
We explicitly compute the optimal cost for a class of example problems in geometric quantum control. These problems are defined by a Cartan decomposition of into orthogon…
Understanding photonic quantum-logic gates: The road to fault tolerance
Till J. Weinhold, Alexei Gilchrist, Kevin J. Resch +4
Fault-tolerant quantum computing requires gates which function correctly despite the presence of errors, and are scalable if the error probability-per-gate is below a threshold val…
A lower bound on the dimension of a quantum system given measured data
Stephanie Wehner, Matthias Christandl, Andrew C. Doherty
We imagine an experiment on an unknown quantum mechanical system in which the system is prepared in various ways and a range of measurements are performed. For each measurement M a…
Transitions in the computational power of thermal states for measurement-based quantum computation
Sean D. Barrett, Stephen D. Bartlett, Andrew C. Doherty +2
We show that the usefulness of the thermal state of a specific spin-lattice model for measurement-based quantum computing exhibits a transition between two distinct "phases" - one…
Network Synthesis of Linear Dynamical Quantum Stochastic Systems
H. I. Nurdin, M. R. James, A. C. Doherty
The purpose of this paper is to develop a synthesis theory for linear dynamical quantum stochastic systems that are encountered in linear quantum optics and in phenomenological mod…
Quantum noise in a nano mechanical Duffing resonator
E. Babourina-Brooks, A. Doherty, G. J. Milburn
We determine the small signal gain and noise response of an amplifier based on the nonlinear response of a quantum nanomechanical resonator. The resonator is biased in the nonlinea…
Applying matrix product operators to model systems with long-range interactions
Gregory M. Crosswhite, Andrew C. Doherty, Guifre Vidal
An algorithm is presented which computes a translationally invariant matrix product state approximation of the ground state of an infinite 1D system; it does this by embedding site…
The quantum moment problem and bounds on entangled multi-prover games
Andrew C. Doherty, Yeong-Cherng Liang, Ben Toner +1
We study the quantum moment problem: Given a conditional probability distribution together with some polynomial constraints, does there exist a quantum state rho and a collection o…
Nanomechanical squeezing with detection via a microwave cavity
M. J. Woolley, A. C. Doherty, G. J. Milburn +1
We study a parametrically-driven nanomechanical resonator capacitively coupled to a microwave cavity. If the nanoresonator can be cooled to near its quantum ground state then quant…
Identifying phases of quantum many-body systems that are universal for quantum computation
Andrew C. Doherty, Stephen D. Bartlett
Quantum computation can proceed solely through single-qubit measurements on an appropriate quantum state, such as the ground state of an interacting many-body system. We investigat…
Optimal tracking for pairs of qubit states
Paulo E. M. F. Mendonca, Alexei Gilchrist, Andrew C. Doherty
In classical control theory, tracking refers to the ability to perform measurements and feedback on a classical system in order to enforce some desired dynamics. In this paper we i…