339 citations · 2k across the 30 of their papers we have counts for
30 papers
Blind Quantum Computation on a Modular Superconducting Processor
Yongxin Song, Johannes Knörzer, Kieran Dalton +2
Current cloud-based quantum processors offer access to advanced hardware hosted on a remote server, but do not guarantee data or algorithm privacy. Blind quantum computation provid…
A Modular Cryogenic Link for Microwave Quantum Communication Over Distances of Tens of Meters
Josua D. Schär, Simon Storz, Paul Magnard +6
Quantum technologies promise a radically new way to solve classically intractable computing problems. Superconducting circuits as a platform are at the forefront of this field. The…
Emission and Absorption of Microwave Photons in Orthogonal Temporal Modes across a 30-Meter Two-Node Network
Alonso Hernández-Antón, Josua D. Schär, Aleksandr Grigorev +6
The tunable interaction between stationary quantum bits and propagating modes of light allows for the encoding of quantum information in the state of itinerant photons. This abilit…
Assessing the Sensitivity of Niobium- and Tantalum-Based Superconducting Qubits to Infrared Radiation
Michael Kerschbaum, Felix Wagner, Uroš Ognjanović +7
The use of tantalum films for superconducting qubits has recently extended qubit coherence times significantly, primarily due to reduced dielectric losses at the metal-air interfac…
Resource-Efficient Cross-Platform Verification with Modular Superconducting Devices
Kieran Dalton, Johannes Knörzer, Finn Hoehne +7
Large-scale quantum computers are expected to benefit from modular architectures. Validating the capabilities of modular devices requires benchmarking strategies that assess perfor…
Performance Characterization of a Multi-Module Quantum Processor with Static Inter-Chip Couplers
Graham J. Norris, Kieran Dalton, Dante Colao Zanuz +8
Three-dimensional integration technologies such as flip-chip bonding are a key prerequisite to realize large-scale superconducting quantum processors. Modular architectures, in whi…
Realization of Constant-Depth Fan-Out with Real-Time Feedforward on a Superconducting Quantum Processor
Yongxin Song, Liberto Beltrán, Ilya Besedin +8
When using unitary gate sequences, the growth in depth of many quantum circuits with output size poses significant obstacles to practical quantum computation. The quantum fan-out o…
Deterministic generation of a 20-qubit two-dimensional photonic cluster state
James O'Sullivan, Kevin Reuer, Aleksandr Grigorev +11
Multidimensional cluster states are a key resource for robust quantum communication, measurement-based quantum computing and quantum metrology. Here, we present a device capable of…
Mitigating Losses of Superconducting Qubits Strongly Coupled to Defect Modes
Dante Colao Zanuz, Quentin Ficheux, Laurent Michaud +16
The dominant contribution to the energy relaxation of state-of-the-art superconducting qubits is often attributed to their coupling to an ensemble of material defects which behave…
Improved Parameter Targeting in 3D-Integrated Superconducting Circuits through a Polymer Spacer Process
Graham J. Norris, Laurent Michaud, David Pahl +4
Three-dimensional device integration facilitates the construction of superconducting quantum information processors with more than several tens of qubits by distributing elements s…
Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
Stefania Lazăr, Quentin Ficheux, Johannes Herrmann +12
The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from non-linear compone…
Realizing a deep reinforcement learning agent discovering real-time feedback control strategies for a quantum system
Kevin Reuer, Jonas Landgraf, Thomas Fösel +10
To realize the full potential of quantum technologies, finding good strategies to control quantum information processing devices in real time becomes increasingly important. Usuall…
Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip
E. Marchiori, L. Ceccarelli, N. Rossi +6
We use a scanning superconducting quantum interference device (SQUID) to image the magnetic flux produced by a superconducting device designed for quantum computing. The nanometer-…
Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons
Kevin Reuer, Jean-Claude Besse, Lucien Wernli +5
Deterministic photon-photon gates enable the controlled generation of entanglement between mobile carriers of quantum information. Such gates have thus far been exclusively realize…
Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems
Paul Magnard, Simon Storz, Philipp Kurpiers +10
Superconducting circuits are a strong contender for realizing quantum computing systems, and are also successfully used to study quantum optics and hybrid quantum systems. However,…
Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
S. Krinner, P. Kurpiers, B. Royer +6
A challenge in building large-scale superconducting quantum processors is to find the right balance between coherence, qubit addressability, qubit-qubit coupling strength, circuit…
Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
Michele C. Collodo, Johannes Herrmann, Nathan Lacroix +7
High fidelity two-qubit gates exhibiting low crosstalk are essential building blocks for gate-based quantum information processing. In superconducting circuits two-qubit gates are…
Realizing a Deterministic Source of Multipartite-Entangled Photonic Qubits
Jean-Claude Besse, Kevin Reuer, Michele C. Collodo +11
Sources of entangled electromagnetic radiation are a cornerstone in quantum information processing and offer unique opportunities for the study of quantum many-body physics in a co…
Primary thermometry of propagating microwaves in the quantum regime
Marco Scigliuzzo, Andreas Bengtsson, Jean-Claude Besse +3
The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing, and may open op…
Parity Detection of Propagating Microwave Fields
Jean-Claude Besse, Simone Gasparinetti, Michele C. Collodo +5
The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example,…
Entanglement Stabilization using Parity Detection and Real-Time Feedback in Superconducting Circuits
Christian Kraglund Andersen, Ants Remm, Stefania Balasiu +6
Fault tolerant quantum computing relies on the ability to detect and correct errors, which in quantum error correction codes is typically achieved by projectively measuring multi-q…
Two-Photon Resonance Fluorescence of a Ladder-Type Atomic System
Simone Gasparinetti, Jean-Claude Besse, Marek Pechal +4
Multi-photon emitters are a sought-after resource in quantum photonics. Nonlinear interactions between a multi-level atomic system and a coherent drive can lead to resonant two-pho…
Quantum communication with time-bin encoded microwave photons
Philipp Kurpiers, Marek Pechal, Baptiste Royer +10
Heralding techniques are useful in quantum communication to circumvent losses without resorting to error correction schemes or quantum repeaters. Such techniques are realized, for…
Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators
Michele C. Collodo, Anton Potočnik, Simone Gasparinetti +6
Networks of nonlinear resonators offer intriguing perspectives as quantum simulators for non-equilibrium many-body phases of driven-dissipative systems. Here, we employ photon corr…