A5084929692- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Superconducting and THz Device Technology
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor Quantum Structures and Devices
- Acoustic Wave Resonator Technologies
- Quantum, superfluid, helium dynamics
- Optical Network Technologies
- Surface and Thin Film Phenomena
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Advanced Frequency and Time Standards
- Gyrotron and Vacuum Electronics Research
- Spectroscopy and Quantum Chemical Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Molecular Junctions and Nanostructures
Yale University
2016-2025
University of New Haven
2016
MIT-Harvard Center for Ultracold Atoms
2011
Massachusetts Institute of Technology
2011
Board of the Swiss Federal Institutes of Technology
2007
ETH Zurich
2007
Université de Sherbrooke
2007
University of Waterloo
2007
University of Connecticut
2006
California Institute of Technology
1993
Short dephasing times pose one of the main challenges in realizing a quantum computer. Different approaches have been devised to cure this problem for superconducting qubits, prime example being operation such devices at optimal working points, so-called ``sweet spots.'' This latter approach led significant improvement ${T}_{2}$ Cooper pair box qubits [D. Vion et al., Science 296, 886 (2002)]. Here, we introduce new type qubit called ``transmon.'' Unlike charge qubit, transmon is designed...
We propose a realizable architecture using one-dimensional transmission line resonators to reach the strong coupling limit of cavity quantum electrodynamics in superconducting electrical circuits. The vacuum Rabi frequency for photons quantized excitations an adjacent circuit (qubit) can easily exceed damping rates both and qubit. This is attractive as macroscopic analog atomic physics experiments computing control, since it provides inhibition spontaneous emission, potentially leading...
The performance of superconducting qubits has improved by several orders magnitude in the past decade. These circuits benefit from robustness superconductivity and Josephson effect, at present they have not encountered any hard physical limits. However, building an error-corrected information processor with many such will require solving specific architecture problems that constitute a new field research. For first time, physicists to master quantum error correction design operate complex...
The topic of quantum noise has become extremely timely due to the rise information physics and resulting interchange ideas between condensed matter AMO/quantum optics communities. This review gives a pedagogical introduction its connections measurement amplification. After introducing spectra methods for their detection, we describe basics weak continuous measurements. Particular attention is given treating standard limit on linear amplifiers position detectors using general linear-response...
Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating behavior and scalability. However, the future prospects ultimately depend upon intrinsic coherence of junctions, whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for employing three-dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to control signal. With architecture, we...
We theoretically study single and two-qubit dynamics in the circuit QED architecture. focus on current experimental design [Wallraff et al., Nature (London) 431, 162 (2004); Schuster 445, 515 (2007)] which superconducting charge qubits are capacitively coupled to a high-$Q$ coplanar resonator. In this system, logical gates realized by driving resonator with microwave fields. Advantages of architecture that it allows for multiqubit between non-nearest realization parallel, opening possibility...
We present a new hardware-efficient paradigm for universal quantum computation which is based on encoding, protecting and manipulating information in harmonic oscillator. This proposal exploits multi-photon driven dissipative processes to encode logical bases composed of Schrödinger cat states. More precisely, we consider two schemes. In first scheme, two-photon process used stabilize qubit basis two-component While such scheme ensures protection the against photon dephasing errors,...
In a Rabi oscillation experiment with superconducting qubit we show that visibility in the excited state population of more than 95% can be attained. We perform dispersive measurement by coupling non-resonantly to transmission line resonator and probing spectrum. The process is well characterized quantitatively understood. Ramsey fringes, coherence time larger 500 ns.
In contrast to a single quantum bit, an oscillator can store multiple excitations and coherences provided one has the ability generate manipulate complex multiphoton states. We demonstrate control by using superconducting transmon qubit coupled waveguide cavity resonator with highly ideal off-resonant coupling. This dispersive interaction is much greater than decoherence rates higher-order nonlinearities allow simultaneous manipulation of hundreds photons. With tool set conditional...
A way to induce quantum stability Dynamical systems, whether classical or quantum, usually require a method stabilize performance and maintain the required state. For instance, communication between computers requires error correction codes ensure that information is transferred correctly. In system, however, very act of measuring it can perturb it. Leghtas et al. show engineering interaction system its environment for delicate states, process could simplify processing. Science , this issue p. 853
We present a detailed characterization of coherence in seven transmon qubits circuit QED architecture. find that spontaneous emission rates are strongly influenced by far off-resonant modes the cavity and can be understood within semiclassical model. A careful analysis qubit decay into microwave transmission-line accurately predict lifetimes over 2 orders magnitude time more than an octave frequency. Coherence times T1 T_{2};{*} microsecond reproducibly demonstrated.
Electron spins in solids are promising candidates for quantum memories superconducting qubits because they can have long coherence times, large collective couplings, and many could be encoded into spin waves of a single ensemble. We demonstrate the coupling electron-spin ensembles to transmission-line cavity at strengths greatly exceeding decay rates comparable linewidths. also perform broadband spectroscopy ruby (Al₂O₃:Cr(3+)) millikelvin temperatures low powers, using an on-chip feedline....
We have performed spectroscopy of a superconducting charge qubit coupled nonresonantly to single mode an on-chip resonator. The strong coupling induces large ac Stark shift in the energy levels both and dispersive resonator frequency is used nondestructively determine state. Photon shot noise measurement field level fluctuations leading dephasing which characteristic for backaction. A crossover line shape with power observed theoretically explained. For weak long intrinsic time T2>200 ns found.
We investigate a hybrid quantum circuit where ensembles of cold polar molecules serve as long-lived memories and optical interfaces for solid state processors. The memory realized by collective spin states (ensemble qubit) is coupled to high-Q stripline cavity via microwave Raman processes. show that convenient trap-surface distances few $\mu$m, strong coupling between the ensemble qubit can be achieved. discuss basic information protocols, including swap from photon bus molecular memory,...