A5101524935- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Quantum Computing Algorithms and Architecture
- Semiconductor Quantum Structures and Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Advanced MEMS and NEMS Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Advanced Frequency and Time Standards
- Geophysics and Sensor Technology
- Quantum-Dot Cellular Automata
- Neural Networks and Reservoir Computing
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Strong Light-Matter Interactions
- Experimental and Theoretical Physics Studies
Joint Quantum Institute
2015-2024
University of Maryland, College Park
2015-2024
Joint Center for Quantum Information and Computer Science
2015-2024
National Institute of Standards and Technology
2015-2024
Forschungszentrum Jülich
2023
Riverlane (United Kingdom)
2022
National Institute of Standards
2015-2020
Office of Science and Technology Policy
2018-2019
The White House
2019
The University of Tokyo
2017-2018
We demonstrated coherent control of a quantum two-level system based on two-electron spin states in double dot, allowing state preparation, manipulation, and projective readout. These techniques are rapid electrical the exchange interaction. Separating later recombining singlet provided measurement dephasing time, T 2 *, ∼10 nanoseconds, limited by hyperfine interactions with gallium arsenide host nuclei. Rabi oscillations were demonstrated, spin-echo pulse sequences used to suppress...
Understanding and controlling the complex environment of solid-state quantum bits is a central challenge in spintronics information science. Coherent manipulation an individual electron spin associated with nitrogen-vacancy center diamond was used to gain insight into its local environment. We show that this effectively separated set proximal 13C nuclear spins, which are coupled coherently spin, remainder cause loss coherence. The spins can be addressed individually because back-action from...
Single qubit rotations and two-qubit CNOT operations are crucial ingredients for universal quantum computing. While high fidelity single have been achieved using the electron spin degree of freedom, realizing a robust gate has major challenge due to rapid nuclear dephasing charge noise. We demonstrate an efficient resonantly-driven spins in silicon. Our platform achieves single-qubit with fidelities >99%, as verified by randomized benchmarking. Gate control exchange coupling allows be...
The emerging field of quantum machine learning has the potential to substantially aid in problems and scope artificial intelligence. This is only enhanced by recent successes classical learning. In this work we propose an approach for systematic treatment learning, from perspective information. Our general covers all three main branches learning: supervised, unsupervised reinforcement While improvements supervised have been reported, received much less attention. Within our approach, tackle...
Recent experiments have demonstrated quantum manipulation of two-electron spin states in double dots using electrically controlled exchange interactions. Here, we present a detailed theory for electron dynamics dot systems that was used to guide these and analyze experimental results. The treats both charge degrees freedom on an equal basis. Specifically, the relaxation dephasing mechanisms are relevant discuss practical approaches control system. We show play important roles two-spin...
We describe a novel protocol for quantum repeater which enables long distance communication through realistic, lossy photonic channels. Contrary to previous proposals, our incorporates active purification of arbitrary errors at each step the using only two qubits station. Because these minimal physical requirements, present can be realized in simple systems such as solid-state single photon emitters. As an example, we show how nitrogen vacancy color centers diamond used implement protocol,...
Robust measurement of single quantum bits plays a key role in the realization computation and communication as well metrology sensing. We have implemented method for improved readout electronic spin qubits solid-state systems. The makes use logic operations on system consisting several proximal nuclear ancillae order to repetitively state spin. Using coherent manipulation nitrogen vacancy center room-temperature diamond, full control an electronic-nuclear up three spins was achieved. took...
We propose an approach to implement quantum repeaters for long-distance communication. Our protocol generates a backbone of encoded Bell pairs and uses the procedure classical error correction during simultaneous entanglement connection. illustrate that repeater with simple Calderbank-Shor-Steane encoding can significantly extend communication distance, while still maintaining fast key generation rate.
Electronic transport is localized in low-dimensional disordered media. The addition of gauge fields to media leads fundamental changes the properties. We implement a synthetic field for photons using silicon-on-insulator technology. By determining distribution properties, we confirm that waves are bulk and localization suppressed edge states. Our system provides new platform investigating properties presence fields.
We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and oscillatory transverse field, allowing rapid full control via rf gate-voltage pulses. demonstrate two-axis at detuning sweet spot, where leakage due to hyperfine coupling is suppressed by large gap. A $\ensuremath{\pi}/2$-gate time of 2.5 ns coherence $19\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$, using multipulse echo, are also demonstrated. Model...
Recent advances in cooling, control, and measurement of mechanical systems the quantum regime have opened possibility first direct observation gravity, at scales achievable experiments. This paper gives a broad overview this idea, using some matter-wave optomechanical to illustrate predictions variety models low-energy gravity. We review treatment perturbatively quantized general relativity as an effective field theory, consider particular challenges observing effects framework. then move on...
The effective interaction between magnetic impurities in metals that can lead to various ground states often competes with a tendency for electrons near screen the local moment (Kondo effect). simplest system exhibiting richness of this competition, two-impurity Kondo system, is here realized experimentally form two quantum dots coupled through an open conducting region. We demonstrate non-local spin control by suppressing and splitting resonances one dot changing electron number coupling...