6.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aalto UniversityFI160 papers
- University of HelsinkiFI89 papers
- Centre National de la Recherche ScientifiqueFR69 papers
- National Institute for AstrophysicsIT65 papers
- Helsinki Institute of PhysicsFI63 papers
- University of ManchesterGB63 papers
- University of MilanIT63 papers
- University of California, Santa BarbaraUS61 papers
- University of TriesteIT58 papers
- Universidad de CantabriaES57 papers
- University of OsloNO57 papers
- University of Rome Tor VergataIT57 papers
56 papers · 1 filter
Twirlator: A Pipeline for Analyzing Subgroup Symmetry Effects in Quantum Machine Learning Ansatzes
Valter Uotila, Väinö Mehtola, Ilmo Salmenperä +1
Symmetry is a strong inductive bias in geometric deep learning and its quantum counterpart, and has attracted increasing attention for improving the trainability of QML models. Yet…
Adaptive time Compressed QITE (ACQ) and its geometrical interpretation
Alberto Acevedo Meléndez, Carmen G. Almudéver, Miguel Angel Garcia-March +8
Imaginary time evolution (ITE) is a well-established method for ground-state preparation, a fundamental problem in many fields such as materials science, chemistry, and optimizatio…
Parameter optimization for the unimon qubit
Rostislav Duda, Eric Hyyppä, Olli Mukkula +2
Inductively shunted superconducting qubits, such as the unimon qubit, combine high anharmonicity with protection from low-frequency charge noise, positioning them as promising cand…
Dissipation and noise in strongly driven Josephson junctions
Vasilii Vadimov, Yoshiki Sunada, Mikko Möttönen
In circuit quantum electrodynamical systems, the quasiparticle-related losses in Josephson junctions are suppressed due to the gap in the superconducting density of states which is…
Initial demonstration of a quantum heat engine based on dissipation-engineered superconducting circuits
Tuomas Uusnäkki, Timm Mörstedt, Wallace Teixeira +2
Quantum heat engines require precise control over thermal reservoirs and the energies of the quantum working medium. Although superconducting circuits enable accurate engineering o…
Proposal for an autonomous quantum heat engine
Miika Rasola, Vasilii Vadimov, Tuomas Uusnäkki +1
We propose and theoretically analyse a superconducting electric circuit which can be used to experimentally realize an autonomous quantum heat engine. Using a quasiclassical, non-M…
Quantum SWAP gate realized with CZ and iSWAP gates in a superconducting architecture
Christian Križan, Janka Biznárová, Liangyu Chen +19
It is advantageous for any quantum processor to support different classes of two-qubit quantum logic gates when compiling quantum circuits, a property that is typically not seen wi…
Adaptive Learning for Quantum Linear Regression
Costantino Carugno, Maurizio Ferrari Dacrema, Paolo Cremonesi
The recent availability of quantum annealers as cloud-based services has enabled new ways to handle machine learning problems, and several relevant algorithms have been adapted to…
Bayesian mitigation of measurement errors in multiqubit experiments
F. Cosco, F. Plastina, N. Lo Gullo
In Phys. Rev. A 108, L060402 (2023), we introduced a Bayesian measurement error mitigation algorithm, which leveraged complete information from the readout signal, and validated th…
Correlation measurement of propagating microwave photons at millikelvin
Aarne Keränen, Qi-Ming Chen, András Gunyhó +5
Microwave photons are important carriers of quantum information in many promising platforms for quantum computing. They can be routinely generated, controlled, and teleported in ex…
Signal crosstalk in a flip-chip quantum processor
Sandoko Kosen, Hang-Xi Li, Marcus Rommel +15
Quantum processors require a signal-delivery architecture with high addressability (low crosstalk) to ensure high performance already at the scale of dozens of qubits. Signal cross…
Rapid on-demand generation of thermal states in superconducting quantum circuits
Timm Fabian Mörstedt, Wallace Santos Teixeira, Arto Viitanen +13
We experimentally demonstrate the fast generation of thermal states of a transmon using a single-junction quantum-circuit refrigerator (QCR) as an in-situ-tunable environment. Thro…
Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters
Aashish Sah, Suman Kundu, Heikki Suominen +2
Achieving fast gates and long coherence times for superconducting qubits presents challenges, typically requiring either a stronger coupling of the drive line or an excessively str…
Many-excitation removal of a transmon qubit using a single-junction quantum-circuit refrigerator and a two-tone microwave drive
Wallace Teixeira, Timm Mörstedt, Arto Viitanen +7
Achieving fast and precise initialization of qubits is a critical requirement for the successful operation of quantum computers. The combination of engineered environments with all…
Nonlinear response theory for lossy superconducting quantum circuits
V. Vadimov, M. Xu, J. T. Stockburger +2
We introduce a numerically exact and computationally feasible nonlinear-response theory developed for lossy superconducting quantum circuits based on a framework of quantum dissipa…
Cryogenic microwave link for quantum local area networks
W. K. Yam, M. Renger, S. Gandorfer +16
Scalable quantum information processing with superconducting circuits is expected to advance from individual processors located in single dilution refrigerators to more powerful di…
Quantum-circuit refrigeration of a superconducting microwave resonator well below a single quantum
Arto Viitanen, Timm Mörstedt, Wallace S. Teixeira +4
We experimentally demonstrate a recently proposed single-junction quantum-circuit refrigerator (QCR) as an in-situ-tunable low-temperature environment for a superconducting 4.7-GHz…
Experimentally verified, fast analytic and numerical design of superconducting resonators in flip-chip architectures
Hang-Xi Li, Daryoush Shiri, Sandoko Kosen +10
In superconducting quantum processors, the predictability of device parameters is of increasing importance as many labs scale up their systems to larger sizes in a 3D-integrated ar…
Single-Shot Readout of a Superconducting Qubit Using a Thermal Detector
András M. Gunyhó, Suman Kundu, Jian Ma +8
Measuring the state of qubits is one of the fundamental operations of a quantum computer. Currently, state-of-the-art high-fidelity single-shot readout of superconducting qubits re…
Microwave quantum diode
Rishabh Upadhyay, Dmitry S. Golubev, Yu-Cheng Chang +4
The fragile nature of quantum circuits is a major bottleneck to scalable quantum applications. Operating at cryogenic temperatures, quantum circuits are highly vulnerable to amplif…
Enhancing qubit readout with Bayesian Learning
F. Cosco, N. Lo Gullo
We introduce an efficient and accurate readout measurement scheme for single and multi-qubit states. Our method uses Bayesian inference to build an assignment probability distribut…
Exceptional-point-assisted entanglement, squeezing, and reset in a chain of three superconducting resonators
Wallace S. Teixeira, Vasilii Vadimov, Timm Mörstedt +2
The interplay between coherent and dissipative dynamics required in various control protocols of quantum technology has motivated studies of open-system degeneracies, referred to a…
Quantum error correction under numerically exact open-quantum-system dynamics
Aravind Plathanam Babu, Tuure Orell, Vasilii Vadimov +3
The known quantum error-correcting codes are typically built on approximative open-quantum-system models such as Born--Markov master equations. However, it is an open question how…
Initial experimental results on a superconducting-qubit reset based on photon-assisted quasiparticle tunneling
V. A. Sevriuk, W. Liu, J. Rönkkö +15
We present here our recent results on qubit reset scheme based on a quantum-circuit refrigerator (QCR). In particular, we use the photon-assisted quasiparticle tunneling through a…