Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- ARC Centre of Excellence for Engineered Quantum SystemsAU357 papers
- Centre National de la Recherche ScientifiqueFR334 papers
- Australian National UniversityAU332 papers
- University College LondonGB296 papers
- University of MichiganUS282 papers
- Australian Astronomical ObservatoryAU271 papers
- University of PortsmouthGB271 papers
- Institució Catalana de Recerca i Estudis AvançatsES269 papers
- Fermi National Accelerator LaboratoryUS266 papers
- Ludwig-Maximilians-Universität MünchenDE258 papers
- Institute for High Energy PhysicsES252 papers
- Centro de Investigaciones Energéticas, Medioambientales y TecnológicasES250 papers
46 papers · 2 filters
Schrodinger cats and their power for quantum information processing
A. Gilchrist, Kae Nemoto, W. J. Munro +4
We outline a toolbox comprised of passive optical elements, single photon detection and superpositions of coherent states (Schrodinger cat states). Such a toolbox is a powerful col…
Measuring a photonic qubit without destroying it
G. J. Pryde, J. L. O'Brien, A. G. White +2
Measuring the polarisation of a single photon typically results in its destruction. We propose, demonstrate, and completely characterise a \emph{quantum non-demolition} (QND) schem…
Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment
Nathan K. Langford, Rohan B. Dalton, Michael D. Harvey +5
We produce and holographically measure entangled qudits encoded in transverse spatial modes of single photons. With the novel use of a quantum state tomography method that only req…
Phase-dependent decoherence of optical transitions in Pr3+:LaF3 in the presence of a driving field
G. J. Pryde, M. J. Sellars, N. B. Manson
The decoherence times of orthogonally phased components of the optical transition dipole moment in a two-level system have been observed to differ by an order of magnitude. This ph…
Quantum Error Correction on Linear Nearest Neighbor Qubit Arrays
Austin G. Fowler, Charles D. Hill, Lloyd C. L. Hollenberg
A minimal depth quantum circuit implementing 5-qubit quantum error correction in a manner optimized for a linear nearest neighbor architecture is described. The canonical decomposi…
Optimal cloning for finite distributions of coherent states
P. T. Cochrane, T. C. Ralph, A. Dolinska
We derive optimal cloning limits for finite Gaussian distributions of coherent states, and describe techniques for achieving them. We discuss the relation of these limits to state…
Teleportation in a non-inertial frame
Paul M. Alsing, David McMahon, G. J. Milburn
In this work, we describe the process of teleportation between Alice in an inertial frame, and Rob who is in uniform acceleration with respect to Alice. The fidelity of the telepor…
Transmission Of Optical Coherent State Qubits
S. Glancy, H. M. Vasconcelos, T. C. Ralph
We discuss the long distance transmission of qubits encoded in optical coherent states. Through absorption these qubits suffer from two main types of errors, the reduction of the a…
Critical fluctuations and entanglement in the nondegenerate parametric oscillator
K. Dechoum, P. D. Drummond, S. Chaturvedi +1
We present a fully quantum mechanical treatment of the nondegenerate optical parametric oscillator both below and near threshold. This is a non-equilibrium quantum system with a cr…
Optimal measurements for relative quantum information
Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measureme…
Stationary two-atom entanglement induced by nonclassical two-photon correlations
R. Tanas, Z. Ficek
A system of two two-level atoms interacting with a squeezed vacuum field can exhibit stationary entanglement associated with nonclassical two-photon correlations characteristic of…
Gaussian quantum operator representation for bosons
Joel F. Corney, Peter D. Drummond
We introduce the Gaussian quantum operator representation, using the most general multi-mode Gaussian operator basis. The representation unifies and substantially extends existing…
One dimensional quantum walk with unitary noise
Daniel Shapira, Ofer Biham, A. J. Bracken +1
The effect of unitary noise on the discrete one-dimensional quantum walk is studied using computer simulations. For the noiseless quantum walk, starting at the origin (n=0) at time…
A characterization of continuous variable entanglement
W. P. Bowen, R. Schnabel, P. K. Lam +1
We present an experimental analysis of quadrature entanglement produced from a pair of amplitude squeezed beams. The correlation matrix of the state is characterized within a set o…
Measuring Controlled-NOT and two-qubit gate operation
Andrew G. White, Alexei Gilchrist, Geoffrey J. Pryde +3
Accurate characterisation of two-qubit gates will be critical for any realisation of quantum computation. We discuss a range of measurements aimed at characterising a two-qubit gat…
Teleportation of continuous variable polarisation states
A. Dolinska, B. C. Buchler, P. K. Lam +2
This paper discusses methods for the optical teleportation of continuous variable polarisation states. We show that using two pairs of entangled beams, generated using four squeeze…
Entanglement, correlations, and the energy gap in many-body quantum systems
Henry L. Haselgrove, Michael A. Nielsen, Tobias J. Osborne
What correlations are present in the ground state of a many-body Hamiltonian? We study the relationship between ground-state correlations, especially entanglement, and the energy g…
Comparison of LOQC C-sign gates with ancilla inefficiency and an improvement to functionality under these conditions
A. P. Lund, T. B. Bell, T. C. Ralph
We compare three proposals for non-deterministic C-sign gates implemented using linear optics and conditional measurements with non-ideal ancilla mode production and detection. The…
A universal quantum circuit for two-qubit transformations with three CNOT gates
G. Vidal, C. M. Dawson
We consider the implementation of two-qubit unitary transformations by means of CNOT gates and single-qubit unitary gates. We show, by means of an explicit quantum circuit, that to…
Quantum entanglement and fixed-point bifurcations
Andrew P. Hines, G. J. Milburn, Ross H. McKenzie
How does the classical phase space structure for a composite system relate to the entanglement characteristics of the corresponding quantum system? We demonstrate how the entanglem…
A de Finetti Representation Theorem for Quantum Process Tomography
Christopher A. Fuchs, Ruediger Schack, Petra F. Scudo
In quantum process tomography, it is possible to express the experimenter's prior information as a sequence of quantum operations, i.e., trace-preserving completely positive maps.…
Lower bounds on the complexity of simulating quantum gates
Andrew M. Childs, Henry L. Haselgrove, Michael A. Nielsen
We give a simple proof of a formula for the minimal time required to simulate a two-qubit unitary operation using a fixed two-qubit Hamiltonian together with fast local unitaries.…
Fungible dynamics: there are only two types of entangling multiple-qubit interactions
Michael J. Bremner, Jennifer L. Dodd, Michael A. Nielsen +1
What interactions are sufficient to simulate arbitrary quantum dynamics in a composite quantum system? It has been shown that all two-body Hamiltonian evolutions can be simulated u…
Numerical Analysis of the Capacities for Two-Qubit Unitary Operations
Dominic W. Berry, Barry C. Sanders
We present numerical results on the capacities of two-qubit unitary operations for creating entanglement and increasing the Holevo information of an ensemble. In all cases tested,…