A5039919049- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Quantum optics and atomic interactions
- Nuclear Materials and Properties
- Magnetic properties of thin films
- Nuclear reactor physics and engineering
- Radioactive element chemistry and processing
- Quantum Computing Algorithms and Architecture
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Quantum many-body systems
- High Temperature Alloys and Creep
- Cold Atom Physics and Bose-Einstein Condensates
- Additive Manufacturing Materials and Processes
- Cultural Insights and Digital Impacts
- Computational Physics and Python Applications
- Utopian, Dystopian, and Speculative Fiction
- Advanced NMR Techniques and Applications
- Diamond and Carbon-based Materials Research
- Semiconductor Lasers and Optical Devices
- Aluminum Alloy Microstructure Properties
- Astrophysics and Cosmic Phenomena
- Quantum Mechanics and Applications
- Molecular Junctions and Nanostructures
University of Cambridge
2013-2023
Microsoft Research (United Kingdom)
2023
Université de Bretagne Occidentale
2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2022
CEA Cadarache
2017-2022
Institut de Radioprotection et de Sûreté Nucléaire
2022
Direction des énergies
2017-2020
Héritage et Création dans le Texte et l'Image
2016-2019
Safran (France)
2016-2018
Safran Electronics (Canada)
2016
Quantum entanglement between distant qubits is an important feature of quantum networks. Distribution over long distances can be enabled through coherently interfacing qubit pairs via photonic channels. Here, we report the realization optically generated electron spin confined in two semiconductor dots. The protocol relies on spin-photon trionic Λ system and erasure Raman-photon path information. measurement a single Raman photon used to project into joint state with interferometrically...
A hight degree of spin polarization is achieved for a Mn atom localized in semiconductor quantum dot using quasi-resonant optical excitation at zero magnetic field. Optically created polarized carriers generate an energy splitting the and enable moment orientation controlled by photon helicity energy. The dynamics field dependence pumping mechanism shows that lifetime isolated anisotropy induced built-in strain dots.
Abstract The interaction between a confined electron and the nuclei of an optically active quantum dot provides uniquely rich manifestation central spin problem. Coherent qubit control combines with ultrafast spin–photon interface to make these spins attractive candidates for optical networks. Reaching full potential coherence has been hindered by lack knowledge key irreversible environment dynamics. Through all-optical Hahn echo decoupling we now recover intrinsic time set inhomogeneously...
Coupling individual quantum systems lies at the heart of building scalable networks. Here, we report first direct photonic coupling between a semiconductor dot and trapped ion demonstrate that single photons generated by controllably change internal state Yb^{+} ion. We ameliorate effect 60-fold mismatch radiative linewidths with coherent photon generation high-finesse fiber-based optical cavity enhancing The transfer information presented here via classical correlations σ_{z} projection...
Coherent excitation of an ensemble quantum objects underpins many-body phenomena and offers the opportunity to realize a memory that stores information. Thus far, deterministic coherent interface between spin qubit such has remained elusive. In this study, we first used electron cool mesoscopic nuclear semiconductor dot sideband-resolved regime. We then implemented all-optical approach access individual quantized electronic-nuclear transitions. Lastly, performed optical rotations single...
Coupling a qubit coherently to an ensemble is the basis for collective quantum memories. A single driven electron in dot can deterministically excite low-energy modes of nuclear spin presence lattice strain. We propose gate state transfer between this central and these excitations-spin waves-in strong magnetic field, where coherence time long. develop microscopic theory capable calculating exact evolution strained electron-nuclear system. With this, we evaluate operation storage show that...
Quantum computing offers significant speedups, but the large number of physical qubits required for quantum error correction introduces engineering challenges a monolithic architecture. One solution is to distribute logical computation across multiple small computers, with non-local operations enabled via distributed Bell states. Previous investigations have largely focused on surface code, which good suppression poor encoding rates, each code instance only able encode single qubit. In this...
A central spin qubit interacting coherently with an ensemble of proximal spins can be used to engineer entangled collective states or a multiqubit register. Making full use this many-body platform requires tuning the interaction between and its GaAs quantum dots offer model realization system where electron interacts multiple ensembles <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mo>∼</a:mo><a:msup><a:mn>10</a:mn><a:mn>4</a:mn></a:msup></a:math> nuclear spins. In...
We report on the observation of spin dependent optically dressed states and optical Stark effect an individual Mn in a semiconductor quantum dot. The vacuum-to-exciton or exciton-to-biexciton transitions Mn-doped dot are by strong laser field resulting spectral signature is measured photoluminescence. demonstrate that energy any state atom can be independently tuned using induced control laser. High resolution spectroscopy reveals power, polarization detuning Autler-Townes splitting each...
We have investigated the spin preparation efficiency by optical pumping of individual Mn atoms embedded in CdTe/ZnTe quantum dots. Monitoring time dependence intensity fluorescence during resonant process dots allows to directly probe dynamics initialization spin. This technique presents convenience including and readout same step. Our measurements demonstrate that initialization, at zero magnetic field, can reach an 75% occurs tens nanoseconds range when a laser resonantly drives saturation...
A controlled quantum system can alter its environment by feedback, leading to reduced-entropy states of the and improved coherence. Here, using a quantum-dot electron spin as control probe, we prepare nuclei under feedback coherent population trapping observe their evolution from thermal state, with immediate consequence extended qubit Via Ramsey interferometry on spin, directly access nuclear distribution following preparation measure emergence decay correlations within ensemble. Under...
A heavy hole confined to an InGaAs quantum dot promises the union of a stable spin and optical coherence form near perfect, high-bandwidth spin-photon interface. Despite theoretical predictions encouraging preliminary measurements, dynamic processes determining are yet be understood. Here, we establish regimes that allow for highly coherent in these systems, recovering crossover from hyperfine electrical-noise dominated decoherence with few-Tesla external magnetic field. Dynamic decoupling...
The ability to discriminate between simultaneously occurring noise sources in the local environment of semiconductor InGaAs quantum dots, such as electric and magnetic field fluctuations, is key understanding their respective dynamics effect on dot coherence properties. We present a discriminatory approach all-optical sensing based two-color resonance fluorescence charged with single electron. Our measurements show that fluctuations due nuclear spins absence an external are described by two...
We report on the dynamics of optically induced nuclear spin polarization in individual CdTe/ZnTe quantum dots loaded with one electron by modulation doping. The fine structure hot trion (charged exciton ${X}^{\ensuremath{-}}$ an $P$ shell) is identified photoluminescence excitation spectra. A negative rate photoluminescence, optical pumping resident electron, and built up dynamic (DNSP) are observed time-resolved experiments when dot excited at higher energy than triplet state. time magnetic...