A5101675768- Quantum Information and Cryptography
- Spectroscopy and Quantum Chemical Studies
- Quantum Mechanics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Photosynthetic Processes and Mechanisms
- Photoreceptor and optogenetics research
- Quantum Computing Algorithms and Architecture
- Photonic and Optical Devices
- Environmental Monitoring and Data Management
- Neural Networks and Reservoir Computing
- Gyrotron and Vacuum Electronics Research
- Atomic and Subatomic Physics Research
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Porphyrin and Phthalocyanine Chemistry
- Advanced Fluorescence Microscopy Techniques
- Mechanical and Optical Resonators
- Molecular Spectroscopy and Structure
- Molecular Junctions and Nanostructures
- Scientific Research and Discoveries
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Quantum many-body systems
University of California, Berkeley
2022-2024
Kavli Energy NanoScience Institute
2022-2023
DEVCOM Army Research Laboratory
2018
University of New Mexico
2007-2015
Mississippi State University
1980-1994
We present a theoretical framework that describes wave packet of light prepared in state definite photon number interacting with an arbitrary quantum system (e.g. harmonic oscillator or multi-level atom). Within this we derive master equations for the as well output field quantities such quadratures and flux. These results are then generalized to packets spectral distribution functions. Finally, obtain systems multiple spatial and/or polarization modes.
Photosynthesis is generally assumed to be initiated by a single photon
A proposal for the realization of a robust quantum gate based on Rydberg atoms is analyzed, and it shown how adiabatic dressing ground state protects from decoherence due to random phase errors usually arising thermal motion.
We develop a method to simulate the excitonic dynamics of realistic photosynthetic light harvesting systems, including non-Markovian coupling phonon degrees freedom, under excitation by N-photon Fock state pulses. This combines input-output and hierarchical equations motion formalisms into double hierarchy density matrix equations. show analytically that weak field relevant natural photosynthesis conditions, an input corresponding coherent give rise equal matrices in excited manifold....
We study quantum tomography based on a stochastic continuous-time measurement record obtained from probe field collectively interacting with an ensemble of identically prepared systems. In comparison to previous studies, we consider here the case in which measurement-induced backaction has non-negligible effect dynamical evolution ensemble. formulate maximum likelihood estimate for initial state given only single instance continuous diffusive record. apply our estimator simplest problem:...
Input-output theory is invaluable for treating superconducting and photonic circuits connected by transmission lines or waveguides. However, this cannot in general handle situations which retroreflections from circuit components configurations of beam splitters create loops the traveling-wave fields that connect systems. Here, building upon network-contraction Gough James [Commun. Math. Phys. 287, 1109 (2009)], we provide a compact powerful method to treat any contains such so long as...
We use quantum trajectory theory to study the dynamics of first step in photosynthesis for a single photon interacting with photosystem II (PSII). By considering individual trajectories we are able look beyond ensemble average compute PSII system evolution conditioned upon counting measurements. Measurements transmitted beam strongly affects state, since detection an outgoing confirms that must be electronic ground while null measurement implies it is excited state. show under ideal...
We show that for a class of quantum light spectroscopy (QLS) experiments using n = 0, 1, 2, ··· classical pulses and an entangled photon pair (a biphoton state) where one acts as reference without interacting with the matter sample, identical signals can be obtained by replacing biphotons classical-like coherent states light, these are defined explicitly in terms parameters states. An input-output formulation nonlinear is used to prove this equivalence. demonstrate equivalence numerically...
In this work we study the first step in photosynthesis for limiting case of a single photon interacting with photosystem II (PSII). We model our system using quantum trajectory theory, which allows us to consider not only average evolution, but also conditional evolution given individual realizations idealized measurements photons that have been absorbed and subsequently emitted as fluorescence. The nature input requires fully both output light fields. show PSII coupled field via three...
Using a photon-counting quantum light spectroscopy that probes photosynthetic harvesting with single photon at time, we experimentally demonstrated photosynthesis begins and proceeds of energy. We report the observation individual single-photon absorption emission events in spatially distinct regions systems. The experiments were carried out on an ensemble pigment-protein complexes light-harvesting 2 from purple bacteria Rhodobacter sphaeroides under ambient conditions vitro.
This dissertation studies the statistics and modeling of a quantum system probed by coherent laser field. We focus on an ensemble qubits dispersively coupled to traveling wave light The first research topic explores measurement quasi-monochromatic probe. identify shortest timescale that successive measurements approximately commute. Our model predicts for probe in near infrared, noncommuting effects are apparent subpicosecond times. second attempts find approximation conditional master...
We provide evidence, based on direct simulation of the quantum Fisher information, that 1/N scaling sensitivity with number atoms N in an atomic magnetometer can be surpassed by double-passing a far-detuned laser through system during Larmor precession. Furthermore, we predict for N>>1, proposed double-pass essentially achieve without requiring any appreciable amount entanglement.
We show that for a class of quantum light spectroscopy (QLS) experiments using n = 0,1,2,$\cdots$ classical pulses and an entangled photon pair (a biphoton state) where one acts as reference without interacting with the matter sample, identical signals can be obtained by replacing biphotons classical-like coherent states light, these are defined explicitly in terms parameters states. An input-output formulation nonlinear is used to prove this equivalence. demonstrate equivalence numerically...
No abstract available.