42 citations · 224 across the 22 of their papers we have counts for
22 papers
On truncations of hierarchical equations of motion for finite-dimensional systems
Vasilii Vadimov
We study truncations of hierarchical equations of motion (HEOM) for finite-dimensional open quantum systems. We prove that for finite-dimensional approximations constructed with a…
Autonomous quantum heat engine
Tuomas Uusnäkki, Miika Rasola, Vasilii Vadimov +3
Quantum heat engines provide attractive means in quantum thermodynamics for studying the fundamentals of the flow of heat and work. Previous experimental implementations of heat en…
Quantum dial
Aashish Sah, Suman Kundu, Priyank Singh +3
Accurate control of quantum degrees of freedom is promising for sensing, communication, and computing, but building a useful quantum computer faces a central isolation-and-control…
Simulating Non-Markovian Dynamics in Open Quantum Systems
Meng Xu, Vasilii Vadimov, J. T. Stockburger +1
Recent advances in quantum technologies and related experiments have created a need for highly accurate, versatile, and computationally efficient simulation techniques for the dyna…
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…
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…
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…
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…
Multimode physics of the unimon circuit
Sasu Tuohino, Vasilii Vadimov, Wallace S. Teixeira +3
We consider a superconducting half-wavelength resonator that is grounded at its both ends and contains a single Josephson junction. Previously this circuit was considered as a unim…
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…
A Universal Framework for Quantum Dissipation:Minimally Extended State Space and Exact Time-Local Dynamics
Meng Xu, Vasilii Vadimov, Malte Krug +2
The dynamics of open quantum systems is formulated in a minimally extended state space comprising the degrees of freedom of a system of interest and a finite set of non-unitary, pu…
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…
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…
Unimon qubit
Eric Hyyppä, Suman Kundu, Chun Fai Chan +22
Superconducting qubits are one of the most promising candidates to implement quantum computers. The superiority of superconducting quantum computers over any classical device in si…
Single-junction quantum-circuit refrigerator
V. Vadimov, A. Viitanen, T. Mörstedt +2
We propose a quantum-circuit refrigerator (QCR) based on photon-assisted quasiparticle tunneling through a single normal-metal--insulator--superconductor (NIS) junction. In contras…
Recent Developments in Quantum-Circuit Refrigeration
Timm Fabian Mörstedt, Arto Viitanen, Vasilii Vadimov +7
We review the recent progress in direct active cooling of the quantum-electric degrees freedom in engineered circuits, or quantum-circuit refrigeration. In 2017, the invention of a…
Inverse Faraday Effect for Superconducting Condensates
S. V. Mironov, A. S. Mel'nikov, I. D. Tokman +3
The Cooper pairs in superconducting condensates are shown to acquire a temperature-dependent dc magnetic moment under the effect of the circularly polarized electromagnetic radiati…
Many-body Majorana-like zero modes without gauge symmetry breaking
V. Vadimov, T. Hyart, J. L. Lado +2
Topological superconductors represent one of the key hosts of Majorana-based topological quantum computing. Typical scenarios for one-dimensional topological superconductivity assu…
Validity of Born-Markov master equations for single and two-qubit systems
Vasilii Vadimov, Jani Tuorila, Tuure Orell +4
The urgent need for reliable simulation tools to match the extreme accuracy needed to control tailored quantum devices highlights the importance of understanding open quantum syste…
Photon-number-dependent effective Lamb shift
Arto Viitanen, Matti Silveri, Máté Jenei +8
The Lamb shift, an energy shift arising from the presence of the electromagnetic vacuum, has been observed in various quantum systems and established as the part of the energy shif…