A5031141626- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Quantum Mechanics and Applications
- Physics of Superconductivity and Magnetism
- advanced mathematical theories
- Cloud Computing and Resource Management
- Advanced Thermodynamics and Statistical Mechanics
- Atomic and Subatomic Physics Research
- Biofield Effects and Biophysics
- Mechanical and Optical Resonators
- Orbital Angular Momentum in Optics
- Superconducting Materials and Applications
- Quantum optics and atomic interactions
- Robotic Process Automation Applications
- Advancements in Semiconductor Devices and Circuit Design
- Quantum-Dot Cellular Automata
- Neural Networks and Reservoir Computing
IQM (Finland)
2022-2024
ETH Zurich
2015-2020
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...
Fast, high-fidelity readout of qubits is crucial in quantum computing. Quantum error correction particular requires the repeated measurement subsets without perturbing any others. Achieving this goal a multiplexed architecture has been challenging, mainly due to crosstalk signals. In work, individual Purcell filters are used for each resonator protect from untargeted signals, and radiative decay. By implementing scheme, which could find broad use near-term multiqubit devices, authors...
Active qubit reset is a key operation in many quantum algorithms, and particularly error correction. Here, we experimentally demonstrate scheme for three-level transmon artificial atom coupled to large bandwidth resonator. The protocol uses microwave-induced interaction between the $|f,0⟩$ $|g,1⟩$ states of transmon-resonator system, with $|g⟩$ $|f⟩$ denoting ground second excited transmon, $|0⟩$ $|1⟩$ photon Fock We characterize process reinitialization system its state less than 500 ns...
Quantum simulations are expected to vastly outperform classical when modeling the dynamics of interacting spin systems. A digital quantum simulation shows that can be studied and predicted, laying groundwork for applications in magnetism.
Variational quantum algorithms are believed to be promising for solving computationally hard problems on noisy intermediate-scale (NISQ) systems. Gaining computational power from these critically relies the mitigation of errors during their execution, which coherence-limited operations is achievable by reducing gate count. Here, we demonstrate an improvement up a factor 3 in algorithmic performance approximate optimization algorithm (QAOA) as measured success probability, implementing...
Tunable coupling of superconducting qubits has been widely studied due to its importance for isolated gate operations in scalable quantum processor architectures. Here, we demonstrate a tunable qubit-qubit coupler based on floating transmon device, which allows us place at least 2 mm apart from each other while maintaining over 50-MHz between the and qubits. In introduced tunable-coupler design, both qubit-coupler couplings are mediated by two waveguides instead relying direct capacitive...
Improving the speed and fidelity of quantum logic gates is essential to reach advantage with future computers. However, fast lead increased leakage errors in superconducting processors based on qubits low anharmonicity, such as transmons. To reduce errors, we propose experimentally demonstrate two new analytical methods, Fourier ansatz spectrum tuning derivative removal by adiabatic gate (FAST DRAG) higher-derivative (HD) DRAG, both which enable shaping single-qubit control pulses frequency...
Fault tolerant quantum computing relies on the ability to detect and correct errors, which in error correction codes is typically achieved by projectively measuring multi-qubit parity operators conditioning operations observed syndromes. Here, we experimentally demonstrate use of an ancillary qubit repeatedly measure $ZZ$ $XX$ two data qubits thereby project their joint state into respective subspaces. By applying feedback conditioned outcomes individual measurements, real-time stabilization...
Superconducting qubits are one of the most promising candidates to implement quantum computers. The superiority superconducting computers over any classical device in simulating random but well-determined circuits has already been shown two independent experiments and important steps have taken error correction. However, currently wide-spread qubit designs do not yet provide high enough performance enable practical applications or efficient scaling logical owing several following issues:...
Quantum technologies, such as communication, computing, and sensing, offer vast opportunities for advanced research development. While an open-source ethos currently exists within some quantum especially in computer programming, we argue that there are additional advantages developing open hardware (OQH). Open encompasses software the control of devices labs, blueprints, toolkits chip design other components, well openly accessible testbeds facilities allow cloud-access to a wider scientific...
One of the most promising ways to transfer quantum information between superconducting qubits is with microwave photons. Enhancing direct channels by time-bin encoding techniques, which map qubit states single-photon emitted at different times, allows detection photon-loss errors, and thus heralded communication possible. The authors realize experimentally benchmark an error-detection scheme that them select only experimental runs in photon state was transmitted successfully, yielding...
Abstract With a growing interest in quantum technology globally, there is an increasing need for accessing relevant physical systems education and research. In this paper we introduce commercially available on-site computer utilizing superconducting technology, offering insights into its fundamental hardware software components. We show how system can be used to teach concepts deepen understanding of theory computing. It offers learning opportunities future talent contributes technological...
We present here our recent results on qubit reset scheme based a quantum-circuit refrigerator (QCR). In particular, we use the photon-assisted quasiparticle tunneling through superconductor--insulator--normal-metal--insulator--superconductor junction to controllably decrease energy relaxation time of during QCR operation. experiment, transmon with dispersive readout. The is capacitively coupled its normal-metal island. employ rapid, square-shaped control voltage pulses durations in range...
We experimentally demonstrate the fast generation of thermal states a transmon using single-junction quantum-circuit refrigerator (QCR) as an in-situ-tunable environment. Through single-shot readout, we monitor up to its third-excited state, assessing population distributions controlled by QCR drive pulses. Whereas cooling can be achieved in weak-drive regime, high-amplitude pulses generate Boltzmann-distributed populations from temperature 110 mK 500 within 100 ns. As propose our work, this...
With a growing interest in quantum technology globally, there is an increasing need for accessing relevant physical systems education and research. In this paper we introduce commercially available on-site computer utilizing superconducting technology, offering insights into its fundamental hardware software components. We show how system can be used to teach concepts deepen understanding of theory computing. It offers learning opportunities future talent contributes technological progress....
Improving the speed and fidelity of quantum logic gates is essential to reach advantage with future computers. However, fast lead increased leakage errors in superconducting processors based on qubits low anharmonicity, such as transmons. To reduce errors, we propose experimentally demonstrate two new analytical methods, Fourier ansatz spectrum tuning derivative removal by adiabatic gate (FAST DRAG) higher-derivative (HD) DRAG, both which enable shaping single-qubit control pulses frequency...
Quantum computing has tremendous potential to overcome some of the fundamental limitations present in classical information processing. Yet, today's technological quality and scaling prevent exploiting its full potential. based on superconducting quantum processing units (QPUs) is among most promising approaches towards practical advantage. In this article basic approach IQM Computers described covering both QPU rest full-stack computer. particular, focus a 20-qubit computer featuring Garnet...
Tunable coupling of superconducting qubits has been widely studied due to its importance for isolated gate operations in scalable quantum processor architectures. Here, we demonstrate a tunable qubit-qubit coupler based on floating transmon device which allows us place at least 2 mm apart from each other while maintaining over 50 MHz between the and qubits. In introduced tunable-coupler design, both qubit-coupler couplings are mediated by two waveguides instead relying direct capacitive...
Quantum technologies such as communications, computing, and sensing offer vast opportunities for advanced research development. While an open-source ethos currently exists within some quantum technologies, especially in computer programming, we argue that there are additional advantages developing open hardware (OQH). Open encompasses software the control of devices labs, blueprints toolkits chip design other components, well openly-accessible testbeds facilities allow cloud-access to a...