A5100361133- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Spectroscopy and Quantum Chemical Studies
- Advanced Thermodynamics and Statistical Mechanics
- Gaussian Processes and Bayesian Inference
- Statistical Mechanics and Entropy
- Cold Atom Physics and Bose-Einstein Condensates
Australian Research Council
2014-2019
Centre for Quantum Computation and Communication Technology
2014-2019
Griffith University
2014-2019
University of Science and Technology of China
2011-2017
Master equations govern the time evolution of a quantum system interacting with an environment, and may be written in variety forms. Time-independent or memoryless master equations, particular, can cast well-known Lindblad form. Any time-local equation, Markovian non-Markovian, fact also Lindblad-like A diagonalization procedure results unique, this sense canonical, representation which used to fully characterize non-Markovianity evolution. Recently, several different measures have been...
Adaptive techniques have important potential for wide applications in enhancing precision of quantum parameter estimation. We present a recursively adaptive state tomography (RAQST) protocol finite dimensional systems and experimentally implement the on two-qubit systems. In this RAQST protocol, an measurement strategy recursive linear regression estimation algorithm are performed. Numerical results show that our can outperform protocols using mutually unbiased bases (MUB) two-stage MUB even...
Full quantum state tomography (FQST) plays a unique role in the estimation of system without priori knowledge or assumptions. Unfortunately, since FQST requires informationally (over)complete measurements, both number measurement bases and computational complexity data processing suffer an exponential growth with size system. A 14-qubit entangled has already been experimentally prepared ion trap, capability for seems to be far away from practical applications. In this paper, is pushed...
The set of all qubit states that can be steered to by measurements on a correlated is predicted form an ellipsoid---called the quantum steering ellipsoid---in Bloch ball. This ellipsoid provides simple visual characterization initial two-qubit state, and various aspects entanglement are reflected in its geometric properties. We experimentally verify these properties via many different polarization-entangled photonic states. Moreover, for pure three-qubit states, volumes two ellipsoids...
The speed of evolution a qubit undergoing nonequilibrium environment with spectral density general ohmic form is investigated. First we reveal non-Markovianity the model, and find that quantified by information backflow Breuer et al. [Phys. Rev. Lett. 103 210401 (2009)] displays nonmonotonic behavior for different values ohmicity parameter s in fixed other parameters maximal can be achieved at specified value s. We also change phase control parameter. Then further discuss relationship...
Identifying and calibrating quantitative dynamical models for physical quantum systems is important a variety of applications. Here we present closed-loop Bayesian learning algorithm estimating multiple unknown parameters in model, using optimised experimental "probe" controls measurement. The estimation based on particle filter, designed to autonomously choose informationally-optimised probe experiments with which compare model predictions. We demonstrate the performance both simulated...
The qubit systems have been the central issue of quantum physics and information processing, various properties applications concerning about qubits extensively discovered verified experimentally. However, it is nontrivial to generalize techniques methods which effectively deal with problems involving system hard verify their utility for higher dimensional system, instance a qutrit. In this paper, we employ Gell-Mann basis parameterize density operator three-level instead using Pauli...
Quantum coherence is the most distinct feature of quantum mechanics. However, inevitable decoherence processes will finally destroy it and make "Schrödinger's cat" invisible in our classical world. In this "quantum-to-classical transition", so-called "largeness" plays a critical role. We experimentally study largeness phenomena bipartite entanglement decay process through depolarizing channel with two-photon entangled states generated from spontaneous parametric down-conversion source. Our...