Andrew G White
School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia. | Australian Research Council Centre of Excellence for Engineered Quantum ...
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Andrew G White:Expert Impact
Concepts for whichAndrew G Whitehas direct influence:Photonic quantum walks,Quantum interrogation,Bound states,Single photons,Polarisation vision,Phase singularities,Entangled qutrits,Quantum systems.
Andrew G White:KOL impact
Concepts related to the work of other authors for whichfor which Andrew G White has influence:Quantum discord,Orbital angular momentum,Single photons,Optical vortices,Weak measurement.
KOL Resume for Andrew G White
School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Brisbane, QLD, 4072, Australia.
Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Brisbane, Australia.
Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Queensland 4072, Australia.
Centre for Engineered Quantum Systems, Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, 4072, Brisbane, Queensland, Australia
Centre for Engineered Quantum Systems, Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
ARC Centre for Quantum Computing and Communication Technology, Australia
Centre for Engineered Quantum Systems, Centre for Quantum Computer and Communication Technology, and School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
Centre for Quantum Computing and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane, Australia
Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
School of Mathematics and Physics, University of Queensland, 4072 Brisbane, Queensland, Australia, .
ARC Centre for Engineered Quantum Systems, ARC Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia
Centre for Quantum Computer Technology and Department of Physics, University of Queensland, QLD 4072, Australia
Centre for Quantum Computer Technology, Department of Physics, University of Queensland, QLD 4072, Brisbane, Australia
Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane, Queensland, Australia
Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia
Centre for Quantum Computer Technology, Physics Department, The University of Queensland, Brisbane, QLD, 4072, Australia
Centre for Quantum Computer Technology, Department of Physics, University of Queensland, Brisbane 4072, Australia
Department of Physics, University of Queensland, St. Lucia, Queensland 4072, Australia
Department of Physics, University of Queensland, QLD 4072 Brisbane, Australia
Physics Div., P-23, MS-H803, Los Alamos National Laboratory, 87545, Los Alamos, NM
Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia
Physics Division P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Los Alamos National Laboratory, 87545, Los Alamos, NM, USA
Los Alamos National Laboratory, P-23, MS-H803, Los Alamos, New Mexico 87545
Physics Department, Australian National University, Canberra ACT 0200, Australia
Fakultät für Physik, Universität Konstanz, D-78434 Konstanz, Germany
Australian National Univ. (Australia)
Fakultät für Physik, Universität Konstanz - D-78434 Konstanz, Germany
Univ. Konstanz (Germany)
Department of Nuclear Physics, Research School of Physical Sciences, Australian National University, GPO Box 4, 2601, ACT, Australia
|controlledz gate state||#1|
|singlephoton device requirements||#1|
|eavesdropper bells inequalities||#1|
|ideal singlephoton emitter||#1|
|observations holonomic phase||#1|
|uncompensated local rotations||#1|
|photons classical interference||#1|
|mechanical thermal state||#1|
|direct measurement detuning||#1|
|terms single photon||#1|
|crossphase modulation absorption||#1|
|tolerances coincidence basis||#1|
|quantum sensors size||#1|
|bells prediction unambiguous||#1|
|photonic quantum gate||#1|
|ideal limit communication||#1|
|circular polarisation partial||#1|
|object entangled state||#1|
|output odd comb||#1|
|reflectivity phase errors||#1|
|evencomb photons revivals||#1|
|signal 25 μw||#1|
|quantum discord cases||#1|
|locked ultrafast laser||#1|
|higherorder photon events||#1|
|quantum measurements untrusted||#1|
|phase modulations π||#1|
|purity multilevel coherence||#1|
|evanescentfield scale length||#1|
|twophoton noon states||#1|
|single photon correlations||#1|
|spatial quantum states||#1|
|output distributions bosons||#1|
|scalable quantum bits||#1|
|experimental implementation device||#1|
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Prominent publications by Andrew G White
Topological phases exhibit some of the most striking phenomena in modern physics. Much of the rich behaviour of quantum Hall systems, topological insulators, and topological superconductors can be traced to the existence of robust bound states at interfaces between different topological phases. This robustness has applications in metrology and holds promise for future uses in quantum computing. Engineered quantum systems—notably in photonics, where wavefunctions can be observed ...
|Known for Bound States | Photonic Quantum Walks | Topologically Protected | Topological Phases | Quantum Systems|
Quantum coherence, present whenever a quantum system exists in a superposition of multiple classically distinct states, marks one of the fundamental departures from classical physics. Quantum coherence has recently been investigated rigorously within a resource-theoretic formalism. However, the finer-grained notion of multilevel coherence, which explicitly takes into account the number of superposed classical states, has remained relatively unexplored. A comprehensive analysis of ...
|Known for Quantum Coherence | Classical Physics | Operational Relevance | Physical Systems | Multipartite Entanglement|
By weakly measuring the polarization of a photon between two strong polarization measurements, we experimentally investigate the correlation between the appearance of anomalous values in quantum weak measurements and the violation of realism and nonintrusiveness of measurements. A quantitative formulation of the latter concept is expressed in terms of a Leggett-Garg inequality for the outcomes of subsequent measurements of an individual quantum system. We experimentally violate the ...
|Known for Garg Inequality | Weak Measurements | Violation Leggett | Anomalous Values | Quantum Theory|
[ PUBLICATION ]
Quantum mechanics allows events to happen with no definite causal order: this can be verified by measuring a causal witness, in the same way that an entanglement witness verifies entanglement. Here, we realize a photonic quantum switch, where two operations A[over ^] and B[over ^] act in a quantum superposition of their two possible orders. The operations are on the transverse spatial mode of the photons; polarization coherently controls their order. Our implementation ensures that the ...
|Known for Quantum Switch | Causal Order | Coherently Controls|
[ PUBLICATION ]
The scaling of optical quantum technologies requires efficient, on-demand sources of highly indistinguishable single photons. Semiconductor quantum dots inserted into photonic structures are ultrabright single-photon sources, yet the indistinguishability is limited by charge noise. Parametric downconversion sources provide highly indistinguishable photons but are operated at very low brightness to maintain high single-photon purity. To date, no technology has provided a bright source ...
|Known for Photon Sources | Solid State | Charge Noise | Optical Quantum Technologies | Resonant Excitation|
A goal of the emerging field of quantum control is to develop methods for quantum technologies to function robustly in the presence of noise. Central issues are the fundamental limitations on the available information about quantum systems and the disturbance they suffer in the process of measurement. In the context of a simple quantum control scenario-the stabilization of nonorthogonal states of a qubit against dephasing-we experimentally explore the use of weak measurements in feedback ...
|Known for Weak Measurements | Quantum Systems | Feedback Control | Nonorthogonal States | Presence Noise|
[ PUBLICATION ]
The promise of tremendous computational power, coupled with the development of robust error-correcting schemes1, has fuelled extensive efforts2 to build a quantum computer. The requirements for realizing such a device are confounding: scalable quantum bits (two-level quantum systems, or qubits) that can be well isolated from the environment, but also initialized, measured and made to undergo controllable interactions to implement a universal set of quantum logic gates3. The usual set ...
|Known for Optical Quantum | Cnot Gate | Control Qubit | Bell States | Experimental Demonstration|
The resources required to characterize the dynamics of engineered quantum systems--such as quantum computers and quantum sensors--grow exponentially with system size. Here we adapt techniques from compressive sensing to exponentially reduce the experimental configurations required for quantum process tomography. Our method is applicable to processes that are nearly sparse in a certain basis and can be implemented using only single-body preparations and measurements. We perform efficient, ...
|Known for Compressive Sensing | Quantum Dynamics | Experimental Configurations | Sparse Basis | Process Matrices|
[ PUBLICATION ]
Shor's powerful quantum algorithm for factoring represents a major challenge in quantum computation. Here, we implement a compiled version in a photonic system. For the first time, we demonstrate the core processes, coherent control, and resultant entangled states required in a full-scale implementation. These are necessary steps on the path towards scalable quantum computing. Our results highlight that the algorithm performance is not the same as that of the underlying quantum circuit ...
|Known for Compiled Version | Experimental Demonstration | Quantum Entanglement | Shor Algorithm | Coherent Control|
Quantum computation promises to solve fundamental, yet otherwise intractable, problems across a range of active fields of research. Recently, universal quantum logic-gate sets—the elemental building blocks for a quantum computer—have been demonstrated in several physical architectures. A serious obstacle to a full-scale implementation is the large number of these gates required to build even small quantum circuits. Here, we present and demonstrate a general technique that harnesses ...
|Known for Quantum Logic | General Technique | Dimensional Hilbert | Wider Application | Photonic Architecture|
Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection ...
|Known for Quantum Steering | Detection Loophole | Measurement Settings | Entangled Photons | Experimental Tests|
[ PUBLICATION ]
BACKGROUND: Animal vision spans a great range of complexity, with systems evolving to detect variations in light intensity, distribution, colour, and polarisation. Polarisation vision systems studied to date detect one to four channels of linear polarisation, combining them in opponent pairs to provide intensity-independent operation. Circular polarisation vision has never been seen, and is widely believed to play no part in animal vision.
METHODOLOGY/PRINCIPAL FINDINGS: Polarisation is ...
|Known for Polarisation Vision | Stokes Parameters | Light Intensity | Ocular Animals | Linearly Circularly|
[ PUBLICATION ]
The desiderata for an ideal photon source are high brightness, high single-photon purity, and high indistinguishability. Defining brightness at the first collection lens, these properties have been simultaneously demonstrated with solid-state sources; however, absolute source efficiencies remain close to the 1% level and indistinguishability has only been demonstrated for photons emitted consecutively on the few-nanoseconds scale. Here, we employ deterministic quantum dot-micropillar ...
|Known for Photon Sources | State Single | Resonant Excitation | Consecutively Emitted | Quantum Dot|
[ PUBLICATION ]
Photopyroelectric (PPE) spectroscopy, in the 350–1,075 nm wavelength range, was used to study the optical properties of electropolymerized melanin films on indium tin oxide (ITO) coated glass. The PPE intensity signal as a function of the wavelength λ, Vn(λ) and its phase Fn(λ) were independently measured. Using the PPE signal intensity and the thermal and optical properties of the pyroelectric detector, we were able to calculate the optical absorption coefficient β of melanin in the ...
|Known for Optical Properties | Melanin Films | Photopyroelectric Spectroscopy | Pyroelectric Detector | Wavelength Λ|
A boson-sampling device is a quantum machine expected to perform tasks intractable for a classical computer, yet requiring minimal nonclassical resources as compared to full-scale quantum computers. Photonic implementations to date employed sources based on inefficient processes that only simulate heralded single-photon statistics when strongly reducing emission probabilities. Boson sampling with only single-photon input has thus never been realized. Here, we report on a boson-sampling ...
|Known for Boson Sampling | Single Photon | Fock States | Classical Computer | Solid State|