A5100330268- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Diamond and Carbon-based Materials Research
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Strong Light-Matter Interactions
- Force Microscopy Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Photonic Crystals and Applications
- Quantum Dots Synthesis And Properties
- Advanced MEMS and NEMS Technologies
- Optical Network Technologies
- Spectroscopy and Laser Applications
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Plasmonic and Surface Plasmon Research
- Advanced Photonic Communication Systems
- Neural Networks and Reservoir Computing
- Topic Modeling
- Magnetic properties of thin films
Southwestern University of Finance and Economics
2023-2025
University of Oregon
2015-2024
Anhui Medical University
2024
China Southern Power Grid (China)
2024
Changsha University of Science and Technology
2024
University of Electronic Science and Technology of China
2020-2023
Harbin Institute of Technology
2023
Zhejiang Gongshang University
2023
Fujian Normal University
2023
Institut de Ciència de Materials de Barcelona
2022
Thermal mechanical motion hinders the use of a system in applications such as quantum information processing. Whereas thermal can be overcome by cooling oscillator to its motional ground state, an alternative approach is exploit mechanically dark mode that protect from dissipation. We have realized coupling two optical modes silica resonator one breathing regime weak optomechanical coupling. The mode, which superposition and decoupled oscillator, still mediate effective between modes. show...
We report the experimental demonstration of storing optical information as a mechanical excitation in silica optomechanical resonator. use writing and readout laser pulses tuned to one frequency below an cavity resonance control coupling between displacement field at resonance. The pulse maps signal excitation. later converts back pulse. storage lifetime is determined by relatively long damping time
Abstract Today, surface acoustic waves (SAWs) and bulk are already two of the very few phononic technologies industrial relevance can been found in a myriad devices employing these nanoscale earthquakes on chip. Acoustic radio frequency filters, for instance, integral parts wireless devices. SAWs particular find applications life sciences microfluidics sensing mixing tiny amounts liquids. In addition to this continuously growing number applications, ideally suited probe control elementary...
We demonstrate optomechanical quantum control of the internal electronic states a diamond nitrogen-vacancy (NV) center in resolved-sideband regime by coupling NV to both optical fields and surface acoustic waves via phonon-assisted transition taking advantage strong excited-state electron-phonon center. Optomechanically driven Rabi oscillations as well interferences between sideband direct dipole-optical transitions are realized. These studies open door using for atomlike motional coupled...
The leading contribution to the polarization dependent four-wave-mixing signal is shown result from density induced dephasing processes. Experimental observations are in qualitative agreement with theoretical calculations based on semiconductor Bloch equations where due excitonic screening has been taken into account.
Normal mode splitting is observed in a cavity QED system, which nitrogen vacancy centers diamond nanocrystals are coupled to whispering gallery modes silica microsphere. The composite nanocrystal-microsphere system takes advantage of the exceptional spin properties as well ultra high quality factor microspheres. observation normal indicates that dipole optical interaction between relevant center and has reached strong coupling regime QED.
We demonstrate slow light via population oscillation in semiconductor quantum-well structures for the first time. A group velocity as low 9600 m/s is inferred from experimentally measured dispersive characteristics. The transparency window exhibits a bandwidth large 2 GHz.
We report an experimental demonstration and theoretical analysis of electromagnetically induced transparency in a GaAs quantum well, which the absorption exciton resonance is reduced by more than twentyfold. The destructive interference this scheme set up control pulse that couples to biexcitons. These studies illustrate many-particle interactions, are inherent semiconductors often detrimental coherences, can also be harnessed manipulate these coherences.
An optomechanical interface that converts quantum states between optical fields with distinct wavelengths is proposed. A mechanical mode couples to two modes via radiation pressure and mediates the state mapping modes. sequence of $\ensuremath{\pi}/2$ pulses enables state-swapping states, as well cooling mode. Theoretical analysis shows high-fidelity conversion can be realized for small photon numbers in systems experimentally achievable parameters. The pulsed process also makes it possible...
We report experimental studies of coherent population trapping (CPT) and spin relaxation in a temperature range 4 K–100 mK silicon vacancy (SiV) center subject to transverse magnetic field. The linewidth, which is determined by dephasing, extracted from power dependent CPT linewidths. Near below 1 K, phonon-induced dephasing becomes negligible compared with that induced the bath naturally abundant C13 atoms. dependence rates agrees theoretical expectation arises primarily orbital first order...
We demonstrate electromagnetically induced transparency in the transient optical response a GaAs quantum well by using nonradiative coherence between heavy-hole and light-hole valence bands.
A composite optical microcavity, in which nitrogen vacancy (NV) centers a diamond nanopillar are coupled to whispering gallery modes silica microsphere, is demonstrated. Nanopillars with diameter as small 200 nm fabricated from bulk crystal by reactive ion etching and positioned nanometer precision near the equator of microsphere. The nanopillar-microsphere system overcomes poor controllability nanocrystal-based microcavity takes full advantage exceptional spin properties NV ultrahigh...
Coherent interconversion between an optical and a mechanical excitation in optomechanical resonator can be used for the storage of pulse as oscillator. This light is enabled by external writing readout pulses at one frequency below resonance. In this paper, we expand earlier experimental study [Phys. Rev. Lett. 107, 133601 (2011)] on storing radial breathing mode silica microsphere. We show that heterodyne beating corresponding retrieved features periodic oscillation with well-defined phase...
Rabi oscillations and adiabatic passage of single electron spins in a diamond nitrogen vacancy center are demonstrated with two Raman-resonant optical pulses that detuned from the respective dipole transitions. We show spin control is nuclear-spin selective can be robust against rapid decoherence, including radiative decay spectral diffusion, underlying A direct comparison between oscillation passage, along detailed theoretical analysis, provides significant physical insights into...
The emerging field of quantum acoustics explores interactions between acoustic waves and artificial atoms their applications in information processing. In this experimental study, we demonstrate the coupling a surface wave (SAW) an electron spin diamond by taking advantage strong strain excited states nitrogen vacancy center, while avoiding short lifetime these states. SAW-spin takes place through lamda-type three-level system where two ground couple to common state phonon-assisted as well...
Dressed spin states, a coupling to continuous radiation fields, can fundamentally change how responds magnetic fluctuations. Using dressed we were able protect an electron in diamond from decoherence. Dressing with resonant microwaves at rate near 1 MHz leads 50 times reduction the linewidth of transition, limited by transit-time broadening. The decoherence and energy level structure states probed optical coherent-population-trapping processes. Compared dynamical decoupling, where effects...
Resonantly excited photoluminescence with femtosecond time resolution reveals the essential role of momentum scattering in emission from excitons quasi-two-dimensional systems. The gradual rise luminescence provides a direct measure exciton rates. An analysis quantum beats determines dephasing results show that rate is considerably larger than rate, indicating breakdown impact approximation commonly assumed coherent optical studies.
We report experimental studies on exciton spin coherence induced via Coulomb correlations between excitons with opposite spins, including associated unbound as well bound pairs. Electromagnetically transparency resulting from the is demonstrated in transient optical response GaAs quantum wells.
Photoluminescence excitation spectroscopy of nitrogen vacancy (NV) centers in type Ib diamond nanocrystals shows that spite spectral diffusion and spin-nonconserving transitions, zero-phonon linewidth as small $16\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$, which is nearly lifetime limited, can be observed at low temperature. Relatively effects have also been a fraction NV centers.
A pulsed scheme for generating robust optical entanglement via the coupling of two modes to a mechanical oscillator is proposed. This inspired by S\o{}rensen-M\o{}lmer approach entangling trapped ions in thermal environment and based on use driving pulses that are slightly detuned from respective sideband resonance. We show certain pulse durations, optomechanical interaction can return its initial state, disentangling systems. The corresponding generation against noise weak as well...
We report an experimental study of transient optomechanically induced transparency (OMIT) using a silica microsphere as model optomechanical resonator. Transient OMIT processes were probed with time-gated heterodyne detection technique. spectral responses also measured the process evolved toward steady state. The behaviors observed are in good agreement theoretical calculations based on coupled-oscillator model. Specifically, characteristic time scale for establishing is determined by...