A5016075205- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Neural Networks and Reservoir Computing
- Quantum, superfluid, helium dynamics
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Thermodynamics and Statistical Mechanics
- Particle accelerators and beam dynamics
- Topological Materials and Phenomena
- Advanced Photonic Communication Systems
- Molecular Junctions and Nanostructures
- Quantum many-body systems
- Optical Network Technologies
- Physics and Engineering Research Articles
- Strong Light-Matter Interactions
- Advanced MEMS and NEMS Technologies
ETH Zurich
2016-2025
Paul Scherrer Institute
2022-2025
Université de Sherbrooke
2007-2021
Canadian Institute for Advanced Research
2021
Quantum Devices (United States)
2017
Board of the Swiss Federal Institutes of Technology
2007-2008
University of Waterloo
2007
Yale University
2003-2007
Friedrich-Alexander-Universität Erlangen-Nürnberg
1999-2006
Forschungszentrum Jülich
1997-1999
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...
Quantum mechanical effects at the macroscopic level were first explored in Josephson junction-based superconducting circuits 1980's. In last twenty years, emergence of quantum information science has intensified research toward using these as qubits processors. The realization that can be made to strongly and controllably interact with microwave photons, quantized electromagnetic fields stored circuits, led creation field circuit electrodynamics (QED), topic this review. While atomic cavity...
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...
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.
Within the last two decades, Quantum Technologies (QT) have made tremendous progress, moving from Noble Prize award-winning experiments on quantum physics into a cross-disciplinary field of applied research. are being developed now that explicitly address individual states and make use 'strange' properties, such as superposition entanglement. The comprises four domains: Communication, Simulation, Computation, Sensing Metrology. One success factor for rapid advancement QT is well-aligned...
Photon-mediated interactions between atoms are of fundamental importance in quantum optics, simulations, and information processing. The exchange real virtual photons gives rise to nontrivial interactions, the strength which decreases rapidly with distance three dimensions. Here, we use two superconducting qubits an open one-dimensional transmission line study much stronger photon-mediated interactions. Making possibility tune these by more than a quarter their transition frequency, observe...
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 theoretically study measurement induced-dephasing of a superconducting qubit in the circuit QED architecture and compare results to those obtained experimentally by Schuster {\it et al.}, [Phys. Rev. Lett. 94, 123602 (2005)]. Strong coupling resonator leads significant ac-Stark shift transition frequency. As result, quantum fluctuations photon number populating cause dephasing qubit. find good agreement between predicted line shape spectrum experimental results. Furthermore, strong...
Creating a train of single photons and monitoring its propagation interaction is challenging in most physical systems, as generally interact very weakly with other systems. However, when confining microwave frequency transmission line resonator, effective photon-photon interactions can be mediated by qubits embedded the resonator. Here, we observe phenomenon photon blockade through second-order correlation function measurements. The experiments clearly demonstrate antibunching continuously...
In quantum information science, the phase of a wave function plays an important role in encoding information. Although most experiments this field rely on dynamic effects to manipulate information, alternative approach is use geometric phase, which has been argued have potential fault tolerance. We demonstrated controlled accumulation Berry's superconducting qubit; we manipulated qubit geometrically by means microwave radiation and observed accumulated interference experiment. found...
We present an ideal realization of the Tavis-Cummings model in absence atom number and coupling fluctuations by embedding a discrete fully controllable superconducting qubits at fixed positions into transmission line resonator. Measuring vacuum Rabi mode splitting with one, two, three strongly coupled to cavity field, we explore both bright dark dressed collective multiqubit states observe $\sqrt{N}$ scaling dipole strength. Our experiments demonstrate novel approach states, such as $W$...
Quantum coherence in solid-state systems has been demonstrated superconducting circuits and semiconductor quantum dots. This paved the way to investigate for information processing with potential benefit of scalability compared other based on atoms, ions photons. Coherent coupling microwave photons, circuit electrodynamics (QED), opened up new research directions enabled long distance qubits. Here we demonstrate how electromagnetic field a resonator can be coupled double dot. The charge...
The speed of quantum gates and measurements is a decisive factor for the overall fidelity protocols when performed on physical qubits with finite coherence time. Reducing time required to distinguish qubit states high therefore critical goal in information science. state-of-the-art readout superconducting based dispersive interaction resonator. Here, we bring this technique its current limit demonstrate how careful design system parameters leads fast high-fidelity without affecting...
A robust cryogenic infrastructure in form of a wired, thermally optimized dilution refrigerator is essential for present and future solid-state based quantum processors. Here, we engineer an extensible setup, which minimizes passive active heat loads, while guaranteeing rapid qubit control readout. We review design criteria drive lines, flux output lines used typical experiments with superconducting circuits describe each type line detail. The load stainless steel NbTi coaxial cables the due...