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Towards a picosecond transform-limited nitrogen-vacancy based single photon source
Chun-Hsu Su, Andrew D. Greentree, Lloyd C. L. Hollenberg
We analyze a nitrogen-vacancy (NV^-) colour centre based single photon source based on cavity Purcell enhancement of the zero phonon line and suppression of other transitions. Opti…
Quantum phase transitions in photonic cavities with two-level systems
M. I. Makin, Jared H. Cole, Charles Tahan +2
Systems of coupled photonic cavities have been predicted to exhibit quantum phase transitions by analogy with the Hubbard model. To this end, we have studied topologies of few (up…
Error correction optimisation in the presence of X/Z asymmetry
Z. W. E. Evans, A. M. Stephens, J. H. Cole +1
By taking into account the physical nature of quantum errors it is possible to improve the efficiency of quantum error correction. Here we consider an optimisation to conventional…
Matterwave Transport Without Transit
M. Rab, J. H. Cole, N. G. Parker +3
Classically it is impossible to have transport without transit, i.e., if the points one, two and three lie sequentially along a path then an object moving from one to three must, a…
Asymmetric quantum error correction via code conversion
A. M. Stephens, Z. W. E. Evans, S. J. Devitt +1
In many physical systems it is expected that environmental decoherence will exhibit an asymmetry between dephasing and relaxation that may result in qubits experiencing discrete ph…
The Photonic Module: an on-demand resource for photonic entanglement
Simon J. Devitt, Andrew D. Greentree, Radu Ionicioiu +3
Photonic entanglement has a wide range of applications in quantum computation and communication. Here we introduce a new device: the "photonic module", which allows for the rapid,…
An electrostatically defined serial triple quantum dot charged with few electrons
D. Schröer, A. D. Greentree, L. Gaudreau +4
A serial triple quantum dot (TQD) electrostatically defined in a GaAs/AlGaAs heterostructure is characterized by using a nearby quantum point contact as charge detector. Ground sta…
Universal fault tolerant quantum computation on bilinear nearest neighbor arrays
A. M. Stephens, A. G. Fowler, L. C. L. Hollenberg
Assuming an array that consists of two parallel lines of qubits and that permits only nearest neighbor interactions, we construct physical and logical circuitry to enable universal…
Subspace Confinement: How good is your qubit?
Simon J. Devitt, Sonia G. Schirmer, Daniel K. L. Oi +2
The basic operating element of standard quantum computation is the qubit, an isolated two-level system that can be accurately controlled, initialized and measured. However, the maj…
A precise CNOT gate in the presence of large fabrication induced variations of the exchange interaction strength
M. J. Testolin, C. D. Hill, C. J. Wellard +1
We demonstrate how using two-qubit composite rotations a high fidelity controlled-NOT (CNOT) gate can be constructed, even when the strength of the interaction between qubits is no…