ORCID Profile
0000-0002-7425-3559
Current Organisation
University of New South Wales
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Applied Mathematics | Calculus of Variations, Systems Theory and Control Theory | Systems Theory And Control | Quantum Chemistry | Control Engineering | Control Systems, Robotics and Automation | Reinforcement learning | Quantum Information, Computation and Communication | Control engineering mechatronics and robotics | Control engineering | Calculus of variations mathematical aspects of systems theory and control theory | Quantum Optics And Lasers
Information and Communication Services not elsewhere classified | Expanding Knowledge in Engineering | Mathematical sciences |
Publisher: Elsevier BV
Date: 03-2014
Publisher: Springer Science and Business Media LLC
Date: 11-08-2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2012
Publisher: American Chemical Society (ACS)
Date: 05-05-2017
DOI: 10.1021/ACS.JPCLETT.7B00877
Abstract: Ultrafast charge migration is of fundamental importance to photoinduced chemical reactions. However, exploring such a quantum dynamical process requires demanding spatial and temporal resolutions. We show how electronic coherence dynamics induced in molecules by a circularly polarized UV pulse can be tracked by using a time-delayed circularly polarized attosecond X-ray pulse. The X-ray probe spectra retrieve an image at different time delays, encoding instantaneous pump-induced circular charge migration information on an attosecond time scale. A time-dependent ultrafast electronic coherence associated with the periodical circular ring currents shows a strong dependence on the helicity of the UV pulse, which may provide a direct approach to access and control the electronic quantum coherence dynamics in photophysical and photochemical reactions in real time.
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/525631
Publisher: Cambridge University Press (CUP)
Date: 21-02-2006
DOI: 10.1017/S0263574705002596
Abstract: A brand-new paradigm of robots–quantum robots–is proposed through the fusion of quantum theory with robot technology. A quantum robot is essentially a complex quantum system which generally consists of three fundamental components: multi-quantum computing units (MQCU), quantum controller/actuator, and information acquisition units. Corresponding to the system structure, several learning control algorithms, including quantum searching algorithms and quantum reinforcement learning algorithms, are presented for quantum robots. The theoretical results show that quantum robots using quantum searching algorithms can reduce the complexity of the search problem from O( $N^2)$ in classical robots to O( $N\\sqrt N)$ . Simulation results demonstrate that quantum robots are also superior to classical robots in efficient learning under novel quantum reinforcement learning algorithms. Considering the advantages of quantum robots, some important potential applications are also analyzed and prospected.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2020
Publisher: Springer Science and Business Media LLC
Date: 19-01-2015
DOI: 10.1038/SREP07873
Publisher: IOP Publishing
Date: 30-10-2009
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2015
Publisher: The Optical Society
Date: 10-04-2015
DOI: 10.1364/OE.23.010018
Publisher: IOP Publishing
Date: 13-01-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2022
Publisher: American Physical Society (APS)
Date: 26-01-2022
Publisher: American Physical Society (APS)
Date: 25-01-2023
Publisher: American Physical Society (APS)
Date: 26-11-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2016
Publisher: IOP Publishing
Date: 18-08-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 05-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 20-01-2020
DOI: 10.1038/S41562-019-0804-2
Abstract: Classical reinforcement learning (CRL) has been widely applied in neuroscience and psychology however, quantum reinforcement learning (QRL), which shows superior performance in computer simulations, has never been empirically tested on human decision-making. Moreover, all current successful quantum models for human cognition lack connections to neuroscience. Here we studied whether QRL can properly explain value-based decision-making. We compared 2 QRL and 12 CRL models by using behavioural and functional magnetic resonance imaging data from healthy and cigarette-smoking subjects performing the Iowa Gambling Task. In all groups, the QRL models performed well when compared with the best CRL models and further revealed the representation of quantum-like internal-state-related variables in the medial frontal gyrus in both healthy subjects and smokers, suggesting that value-based decision-making can be illustrated by QRL at both the behavioural and neural levels.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2021
Publisher: IOP Publishing
Date: 21-09-2012
Publisher: Optica Publishing Group
Date: 12-02-2020
DOI: 10.1364/OL.386879
Abstract: Controlling coherence and interference of quantum states is one of the central goals in quantum science. Different from energetically discrete quantum states, however, it remains a demanding task to visualize coherent properties of degenerate states (e.g., magnetic sublevels). It becomes further inaccessible in the absence of an external perturbation (e.g., Zeeman effect). Here, we present a theoretical analysis of all-optical control of degenerate magnetic states in the molecular hydrogen ion, H 2 + , by using two time-delayed co- and counterrotating circularly polarized attosecond extreme-ultraviolet (XUV) pulses. We perform accurate simulations to examine this model by solving the three-dimensional time-dependent Schrödinger equation. A counterintuitive phenomenon of quantum interference between degenerate magnetic sublevels appears in the time-dependent electronic probability density, which is observable by using x-ray-induced transient angular and energy-resolved photoelectron spectra. This work provides an insight into quantum interference of electron dynamics inside molecules at the quantum degeneracy level.
Publisher: Institution of Engineering and Technology (IET)
Date: 10-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2019
Publisher: Institution of Engineering and Technology (IET)
Date: 02-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CP00512E
Abstract: Optimal and robust control of quantum state transfer between states by incorporating a filtering function into optimization algorithm.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2021
Publisher: Elsevier BV
Date: 2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: IEEE
Date: 12-2013
Publisher: Informa UK Limited
Date: 06-03-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2023
Publisher: IEEE
Date: 12-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2012
Publisher: IOP Publishing
Date: 02-08-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2019
Publisher: American Physical Society (APS)
Date: 22-04-2020
Publisher: IOP Publishing
Date: 21-09-2005
Publisher: Springer Science and Business Media LLC
Date: 13-12-2013
DOI: 10.1038/SREP03496
Abstract: A simple yet efficient state reconstruction algorithm of linear regression estimation (LRE) is presented for quantum state tomography. In this method, quantum state reconstruction is converted into a parameter estimation problem of a linear regression model and the least-squares method is employed to estimate the unknown parameters. An asymptotic mean squared error (MSE) upper bound for all possible states to be estimated is given analytically, which depends explicitly upon the involved measurement bases. This analytical MSE upper bound can guide one to choose optimal measurement sets. The computational complexity of LRE is O ( d 4 ) where d is the dimension of the quantum state. Numerical ex les show that LRE is much faster than maximum-likelihood estimation for quantum state tomography.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2018
Publisher: IEEE
Date: 07-2016
Publisher: IEEE
Date: 10-2018
Publisher: IEEE
Date: 10-2018
Publisher: Elsevier BV
Date: 07-2017
Publisher: American Chemical Society (ACS)
Date: 08-12-2017
DOI: 10.1021/ACS.JPCLETT.6B02613
Abstract: Exploring molecular breakup processes induced by light-matter interactions has both fundamental and practical implications. However, it remains a challenge to elucidate the underlying reaction mechanism in the strong field regime, where the potentials of the reactant are modified dramatically. Here we perform a theoretical analysis combined with a time-dependent wavepacket calculation to show how a strong ultrafast laser field affects the photofragment products. As an ex le, we examine the photochemical reaction of breaking up the molecule NaI into the neutral atoms Na and I, which due to inherent nonadiabatic couplings are indirectly formed in a stepwise fashion via the reaction intermediate NaI*. By analyzing the angular dependencies of fragment distributions, we are able to identify the reaction intermediate NaI* from the weak to the strong field-induced nonadiabatic regimes. Furthermore, the energy levels of NaI* can be extracted from the quantum interference patterns of the transient photofragment momentum distribution.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2019
Publisher: Elsevier BV
Date: 07-2017
Publisher: American Physical Society (APS)
Date: 18-04-2019
Publisher: AIP Publishing
Date: 15-10-2008
DOI: 10.1063/1.2992557
Abstract: An incoherent control scheme for state control of locally controllable quantum systems is proposed. This scheme includes three steps: (1) litude lification of the initial state by a suitable unitary transformation, (2) projective measurement of the lified state, and (3) final optimization by a unitary controlled transformation. The first step increases the litudes of some desired eigenstates and the corresponding probability of observing these eigenstates, the second step projects, with high probability, the lified state into a desired eigenstate, and the last step steers this eigenstate into the target state. Within this scheme, two control algorithms are presented for two classes of quantum systems. As an ex le, the incoherent control scheme is applied to the control of a hydrogen atom by an external field. The results support the suggestion that projective measurements can serve as an effective control and local controllability information can be used to design control laws for quantum systems. Thus, this scheme establishes a subtle connection between control design and controllability analysis of quantum systems and provides an effective engineering approach in controlling quantum systems with partial controllability information.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: IEEE
Date: 12-2019
Publisher: Informa UK Limited
Date: 18-09-2009
Publisher: Springer Science and Business Media LLC
Date: 30-11-2011
Publisher: American Physical Society (APS)
Date: 20-04-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2008
Publisher: Wiley
Date: 06-06-2016
DOI: 10.1002/RNC.3577
Publisher: Springer Science and Business Media LLC
Date: 19-06-2012
Publisher: Elsevier BV
Date: 2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2020
Publisher: Springer Science and Business Media LLC
Date: 24-04-2017
DOI: 10.1038/S41534-017-0016-4
Abstract: Adaptive techniques have great potential for wide application in enhancing the precision of quantum parameter estimation. We present an adaptive quantum state tomography protocol for finite dimensional quantum systems and experimentally implement the adaptive tomography protocol on two-qubit systems. In this adaptive quantum state tomography protocol, an adaptive measurement strategy and a recursive linear regression estimation algorithm are performed. Numerical results show that our adaptive quantum state tomography protocol can outperform tomography protocols using mutually unbiased bases and the two-stage mutually unbiased bases adaptive strategy, even with the simplest product measurements. When nonlocal measurements are available, our adaptive quantum state tomography can beat the Gill–Massar bound for a wide range of quantum states with a modest number of copies. We use only the simplest product measurements to implement two-qubit tomography experiments. In the experiments, we use error-compensation techniques to tackle systematic error due to misalignments and imperfection of wave plates, and achieve about a 100-fold reduction of the systematic error. The experimental results demonstrate that the improvement of adaptive quantum state tomography over nonadaptive tomography is significant for states with a high level of purity. Our results also show that this adaptive tomography method is particularly effective for the reconstruction of maximally entangled states, which are important resources in quantum information.
Publisher: Springer International Publishing
Date: 2023
Publisher: Institution of Engineering and Technology (IET)
Date: 12-2010
Publisher: IEEE
Date: 05-2019
Publisher: Elsevier BV
Date: 12-2021
Publisher: IOP Publishing
Date: 28-06-2006
Publisher: Informa UK Limited
Date: 2011
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 09-2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2020
Publisher: IEEE
Date: 11-2013
Publisher: IEEE
Date: 07-2014
Publisher: Springer Science and Business Media LLC
Date: 19-06-2020
DOI: 10.1038/S41534-020-0283-3
Abstract: The dynamics of open quantum systems and manipulation of quantum resources are both of fundamental interest in quantum physics. Here, we investigate the relation between quantum Markovianity and coherence, providing an effective way for detecting non-Markovianity based on the quantum-incoherent relative entropy of coherence ( $${\\mathcal{Q}}{\\mathcal{I}}$$ Q I REC). We theoretically show the relation between completely positive (CP) isibility and the monotonic behavior of the $${\\mathcal{Q}}{\\mathcal{I}}$$ Q I REC. Also we implement an all-optical experiment to demonstrate that the behavior of the $${\\mathcal{Q}}{\\mathcal{I}}$$ Q I REC is coincident with the entanglement shared between the system and the ancilla for both Markovian and non-Markovian evolution while other coherence-based non-Markovian information carriers violate monotonicity, even in Markovian processes. Moreover, both theoretically and experimentally, we show that non-Markovianity enhances the ability of creating coherence on an ancilla. This is the first experimental study of the relation between dynamical behavior of the $${\\mathcal{Q}}{\\mathcal{I}}$$ Q I REC and the phenomenon of information backflow. Our methods for detecting non-Markovianity are applicable to general quantum evolutions.
Publisher: IOP Publishing
Date: 02-03-2016
Publisher: IEEE
Date: 07-2014
Publisher: The Optical Society
Date: 08-11-2019
DOI: 10.1364/OE.27.034416
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2008
Publisher: IEEE
Date: 06-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2023
Publisher: American Physical Society (APS)
Date: 21-08-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2017
Publisher: IEEE
Date: 10-2019
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 07-2017
Publisher: IEEE
Date: 12-2017
Publisher: IEEE
Date: 06-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Elsevier BV
Date: 12-2012
Publisher: Informa UK Limited
Date: 25-03-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 10-02-2012
Publisher: IEEE
Date: 12-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2018
Publisher: Springer Science and Business Media LLC
Date: 26-10-2016
DOI: 10.1038/SREP36090
Abstract: Constructing a set of universal quantum gates is a fundamental task for quantum computation. The existence of noises, disturbances and fluctuations is unavoidable during the process of implementing quantum gates for most practical quantum systems. This paper employs a s ling-based learning method to find robust control pulses for generating a set of universal quantum gates. Numerical results show that the learned robust control fields are insensitive to disturbances, uncertainties and fluctuations during the process of realizing universal quantum gates.
Publisher: Elsevier BV
Date: 07-0006
Publisher: Springer International Publishing
Date: 2023
Publisher: Springer International Publishing
Date: 2023
Publisher: American Physical Society (APS)
Date: 10-03-2017
Publisher: IOP Publishing
Date: 26-03-2021
Abstract: We investigate the weak-force sensing in an optomechanical resonator by Kalman filter. By discretizing the continuous-time optomechanical system, the state of the resulting system is estimated by the unbiased minimum variance Kalman filter. Subsequently, the external stochastic force is estimated, provided that all noises in the system are white and Gaussian. Furthermore, the accuracy of force estimation, described by the mean squared error, is derived theoretically. The proposed algorithm is finally illustrated by comparing the theoretical accuracy with the numerical accuracy in an explicit ex le.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2008
Publisher: Springer International Publishing
Date: 2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Publisher: American Physical Society (APS)
Date: 05-02-2014
Publisher: Springer International Publishing
Date: 2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2008
Publisher: Springer International Publishing
Date: 2023
Publisher: Springer International Publishing
Date: 2023
Publisher: Springer International Publishing
Date: 2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2017
Publisher: Springer International Publishing
Date: 2023
Publisher: IEEE
Date: 12-2012
Publisher: Springer International Publishing
Date: 2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA16158H
Abstract: In this paper, we show that robust laser pulses can be obtained by a s ling-based method to achieve a desired charge transfer probability with limited sensitivity to the arrival time of laser pulses.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2022
Start Date: 05-2010
End Date: 04-2013
Amount: $250,182.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2019
End Date: 02-2022
Amount: $408,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2023
End Date: 06-2027
Amount: $976,069.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2013
End Date: 04-2016
Amount: $315,000.00
Funder: Australian Research Council
View Funded Activity