A5054166029- Photonic and Optical Devices
- Photonic Crystals and Applications
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Quantum and electron transport phenomena
- Strong Light-Matter Interactions
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
- Fern and Epiphyte Biology
- Advanced Fiber Laser Technologies
- Nonlinear Photonic Systems
- Terahertz technology and applications
- Quantum Computing Algorithms and Architecture
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Optic Sensors
- Spectroscopy and Laser Applications
- Topological Materials and Phenomena
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Force Microscopy Techniques and Applications
The University of Sydney
2007-2023
ARC Centre of Excellence for Engineered Quantum Systems
2022-2023
Leibniz University Hannover
2018-2023
Max Planck Institute for Gravitational Physics
2018-2021
University of Copenhagen
2014-2018
Centre for Ultrahigh Bandwidth Devices for Optical Systems
2009-2015
Optical Sciences (United States)
2010
University of Technology Sydney
2009
Quantum dots embedded in photonics nanostructures provide unprecedented control over the interaction between light and matter. This review gives an overview of theoretical principles involved, as well applications ranging from high-precision quantum electrodynamics experiments to quantum-information processing.
A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes promising system for the realization of single-photon transistors, quantum-logic gates based on giant nonlinearities, and high bit-rate deterministic sources. The key figure merit such devices is $\beta$-factor, which probability an emitted single photon be channeled into desired mode. We report experimental achievement $\beta = 98.43 \pm 0.04\%$ dot photonic-crystal waveguide, corresponding single-emitter...
Strong nonlinear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, are usually feeble therefore all-optical gates tend to be inefficient. A quantum emitter deterministically coupled a propagating mode fundamentally changes the situation, since each photon inevitably interacts with emitter, highly correlated many-photon states may created . Here we show that single dot in photonic-crystal waveguide can utilized as giant...
We theoretically study the few- and many-body dynamics of photons in chiral waveguides. In particular, we examine pulse propagation through an ensemble N two-level systems chirally coupled to a waveguide. show that system supports correlated multiphoton bound states, which have well-defined photon number n propagate with group delay scaling as 1/n2. This has interesting consequence that, during propagation, incident coherent-state breaks up into different bound-state components can become...
We propose a scalable architecture for quantum network based on simple on-chip photonic circuit that performs loss-tolerant two-qubit measurements. The consists of two emitters positioned in the arms an Mach-Zehnder interferometer composed waveguides with chiral-light-matter interfaces. efficient interaction allows to perform high-fidelity intranode parity measurements within single chip and emit photons generate internode entanglement, without any need reconfiguration. show that, by...
We show that strongly correlated photon transport can be observed in waveguides containing optically dense ensembles of emitters. Remarkably, this occurs even for weak coupling efficiencies. Specifically, we compute the properties through a chirally coupled system $N$ two-level systems driven by coherent field, where each emitter also scatter photons out waveguide. The correlations arise due to an interplay nonlinearity and loss reservoir, which creates strong effective interaction between...
Abstract The interaction between photons and a single two-level atom constitutes fundamental paradigm in quantum physics. nonlinearity provided by the leads to strong dependence of light–matter interface on number interacting with system within its emission lifetime. This unveils strongly correlated quasiparticles known as photon bound states, giving rise key physical processes such stimulated soliton propagation. Although signatures consistent existence states have been measured Rydberg...
We design photonic crystal waveguides with efficient chiral light-matter interfaces that can be integrated solid-state quantum emitters.By using glide-plane-symmetric waveguides, we show interaction exist even in the presence of slow light slow-down factors up to 100 and therefore exhibits both strong Purcell enhancement chirality.This allows for near-unity directional β-factors a range emitter positions frequencies.Additionally, an mode adapter couple from standard nanobeam waveguide...
Although the strengths of optical nonlinearities available experimentally have been rapidly increasing in recent years, significant challenges remain to using such produce useful quantum devices as efficient Bell state analyzers or universal gates. Here we describe a new approach that avoids current limitations by combining strong with active Gaussian operations protocols for and controlled-sign
Waveguide QED with cold atoms provides a potent platform for the study of non-equilibrium, many-body, and open-system quantum dynamics. Even weak coupling strong photon loss, collective enhancement light-atom interactions leads to correlations photons arising in transmission, as shown recent experiments. Here we apply an improved mean-field theory based on higher-order cumulant expansions describe experimentally relevant, but theoretically elusive, regime driving large ensembles. We...
We observe that a weak guided light field transmitted through an ensemble of atoms coupled to optical nanofiber exhibits quadrature squeezing. From the measured squeezing spectrum we gain direct access phase and amplitude energy-time entangled part two-photon wave function which arises from strongly correlated transport photons ensemble. For small atomic ensembles close line shape transition, while sidebands are observed for sufficiently large ensembles, in agreement with our theoretical...
Planar photonic nanostructures have recently attracted a great deal of attention for quantum optics applications. In this paper, we carry out full 3D numerical simulations to fully account all radiation channels and thereby quantify the coupling efficiency emitter embedded in photonic-crystal waveguide. We determine leakage from surrounding environment study its spectral spatial dependence. The maps efficiency, β factor, reveal that even moderately slow light, near-unity factor is achievable...
Faithful conversion of quantum signals between microwave and optical frequency domains is crucial for building networks based on superconducting circuits. Optoelectromechanical systems, in which cavity modes are coupled to a common mechanical oscillator, promising route towards this goal. In these efficient, low-noise possible using mechanically dark mode the fields, but bandwidth limited fraction linewidth. Here, we show that an array optoelectromechanical transducers can overcome...
We investigate theoretically the performance of photonic crystal fibres with coated holes as refractive index sensors. show that coating a high-index material allows to extend extreme sensitivities analyte-waveguide based geometries offer case low-index analytes, including water-based solutions. As sensitivity these sensors is intricately linked cutoff single inclusion analyte index, our approach relies on derivation equations for inclusions. This performed analytically without...
We investigate the formation and coupling of defect modes in two-dimensional photonic crystal (PC) band gaps associated with degenerate edges. Using a method based on Green's functions perturbation theory, we derive condition for degeneracy mode PC gap. show that interaction between multiple defects splits this provide semi-analytic model splitting using $4\ifmmode\times\else\texttimes\fi{}4$ tight-binding matrix. observe structure matrix is related to overlap corresponding symmetry modes....
A microfluidic double heterostructure cavity is created in a silicon planar photonic crystal waveguide by selective infiltration of liquid crystal.The spectral evolution the resonances probed evanescent coupling reveals that evaporates, even at room temperature, despite its relatively low vapor pressure 5 × 10 3 Pa.We explore and evaporation dynamics within using Fabry-Perot model accounts for joint effects volume reduction length variation due to evaporation.While discussing how pattern...
I introduce and analyze chiral light-matter interaction in the ultrastrong coupling limit where rotating-wave approximation cannot be made. Within this limit, a two-level system with circularly polarized transition dipole interacts copolarized mode through terms. However, counterrotating terms allow to couple counterpolarized same strength, i.e., one that is completely decoupled within approximation. Although such Hamiltonian not particle number conserving, conservation of angular momentum...
We investigate the modes of coupled waveguides in a hexagonal photonic crystal. find that for substantial parameter range waveguide have dispersion relations exhibiting multiple intersections, which we explain both intuitively and using rigorous tight-binding argument.
We develop a formalism based on time-dependent wave-function ansatz to study correlations of photons emitted from collection two-level quantum emitters. show how simulate the system dynamics and evaluate intensity scattered second-order correlation function $g^{(2)}$ in terms amplitudes different components wave function. Our approach is efficient for considering systems that contain up two excitations. To demonstrate this we first consider example spectral filtering single emitter. our can...
We investigate the modes of double heterostructure cavities where underlying photonic crystal waveguide has been dispersion engineered to have two band-edges inside Brillouin zone.By deriving and using a perturbative method, we show that these structures possess modes.For unapodized cavities, relative detuning can be controlled by changing cavity length, for particular lengths, resonant-like effect makes degenerate.For apodized no such resonances exist are always non-degenerate.