109 citations · 727 across the 29 of their papers we have counts for
29 papers · 1 filter
Revealing inadvertent periodic modulation of qubit frequency
Filip Wudarski, Yaxing Zhang, Juan Atalaya +1
The paper describes the means to reveal and characterize slow periodic modulation of qubit frequency. Such modulation can come from different sources and can impact qubit stability…
Nonergodic measurements of qubit frequency noise
Filip Wudarski, Yaxing Zhang, M. I. Dykman
Slow fluctuations of a qubit frequency are one of the major problems faced by quantum computers. To understand their origin it is necessary to go beyond the analysis of their spect…
Towards solving the Fermi-Hubbard model via tailored quantum annealers
Ryan Levy, Zoe Gonzalez Izquierdo, Zhihui Wang +8
The Fermi-Hubbard model (FHM) on a two dimensional square lattice has long been an important testbed and target for simulating fermionic Hamiltonians on quantum hardware. We presen…
Characterizing low-frequency qubit noise
Filip Wudarski, Yaxing Zhang, Alexander Korotkov +2
Fluctuations of the qubit frequencies are one of the major problems to overcome on the way to scalable quantum computers. Of particular importance are fluctuations with the correla…
Two-Unitary Decomposition Algorithm and Open Quantum System Simulation
Nishchay Suri, Joseph Barreto, Stuart Hadfield +3
Simulating general quantum processes that describe realistic interactions of quantum systems following a non-unitary evolution is challenging for conventional quantum computers tha…
A class of Bell diagonal entanglement witnesses in : optimization and the spanning property
Anindita Bera, Filip A. Wudarski, Gniewomir Sarbicki +1
Two classes of Bell diagonal indecomposable entanglement witnesses in are considered. Within the first class, we find a generalization of the we…
Dual Map Framework for Noise Characterization of Quantum Computers
James Sud, Jeffrey Marshall, Zhihui Wang +2
In order to understand the capabilities and limitations of quantum computers, it is necessary to develop methods that efficiently characterize and benchmark error channels present…
Practical Verification of Quantum Properties in Quantum Approximate Optimization Runs
M. Sohaib Alam, Filip A. Wudarski, Matthew J. Reagor +7
In order to assess whether quantum resources can provide an advantage over classical computation, it is necessary to characterize and benchmark the non-classical properties of quan…
Real time evolution for ultracompact Hamiltonian eigenstates on quantum hardware
Katherine Klymko, Carlos Mejuto-Zaera, Stephen J. Cotton +9
In this work we present a detailed analysis of variational quantum phase estimation (VQPE), a method based on real-time evolution for ground and excited state estimation on near-te…
Entanglement Across Separate Silicon Dies in a Modular Superconducting Qubit Device
Alysson Gold, JP Paquette, Anna Stockklauser +15
Assembling future large-scale quantum computers out of smaller, specialized modules promises to simplify a number of formidable science and engineering challenges. One of the prima…
Quantum algorithms with local particle number conservation: noise effects and error correction
Michael Streif, Martin Leib, Filip Wudarski +2
Quantum circuits with local particle number conservation (LPNC) restrict the quantum computation to a subspace of the Hilbert space of the qubit register. In a noiseless or fault-t…
Augmented fidelities for single qubit gates
Filip Wudarski, Jeffrey Marshall, Andre Petukhov +1
An average gate fidelity is a standard performance metric to quantify deviation between an ideal unitary gate transformation and its realistic experimental implementation. The aver…
Entanglement Production and Convergence Properties of the Variational Quantum Eigensolver
Andreas J. C. Woitzik, Panagiotis Kl. Barkoutsos, Filip Wudarski +2
We perform a systematic investigation of variational forms (wave function Ansätze), to determine the ground state energies and properties of two-dimensional model fermionic systems…
Characterizing local noise in QAOA circuits
Jeffrey Marshall, Filip Wudarski, Stuart Hadfield +1
Recently Xue et al. [arXiv:1909.02196] demonstrated numerically that QAOA performance varies as a power law in the amount of noise under certain physical noise models. In this shor…
Channel Coding of a Quantum Measurement
Spiros Kechrimparis, Chahan M. Kropf, Filip Wudarski +1
In this work, we consider the preservation of a measurement for quantum systems interacting with an environment. Namely, a method of preserving an optimal measurement over a channe…
Optimizing quantum heuristics with meta-learning
Max Wilson, Sam Stromswold, Filip Wudarski +3
Variational quantum algorithms, a class of quantum heuristics, are promising candidates for the demonstration of useful quantum computation. Finding the best way to amplify the per…
Experimental investigation of Markovian and non-Markovian channel addition
S. A. Uriri, F. Wudarski, I. Sinayskiy +2
The study of memory effects in quantum channels helps in developing characterization methods for open quantum systems and strategies for quantum error correction. Two main sets of…
From Ansätze to Z-gates: a NASA View of Quantum Computing
Eleanor G. Rieffel, Stuart Hadfield, Tad Hogg +12
For the last few years, the NASA Quantum Artificial Intelligence Laboratory (QuAIL) has been performing research to assess the potential impact of quantum computers on challenging…
Output statistics of quantum annealers with disorder
Jonathan Brugger, Christian Seidel, Michael Streif +3
We demonstrate that the output statistics of a quantum annealing protocol run on D-Wave 2000Q can be explained by static disorder garnishing an otherwise ideal device hardware. A B…
Entanglement witnesses from mutually unbiased bases
Dariusz Chruściński, Gniewomir Sarbicki, Filip Wudarski
We provide a class of entanglement witnesses constructed in terms of Mutually Unbiased Bases (MUBs). This construction reproduces many well-known examples like the celebrated reduc…
Robustness and fragility of Markovian dynamics in a qubit dephasing channel
Filip A. Wudarski, Francesco Petruccione
The Markovian dynamics of a qubit is investigated in the scheme of random unitary dynamics, where Kraus operators are changed by an extra noise. The behavior of Markovianity is exp…
Markovian semigroup from non-Markovian evolutions
F. A. Wudarski, D. Chruściński
It is shown that a convex combination of two non-Markovian evolutions may lead to Markovian semigroup. This shows that convex combination of quantum evolutions displaying nontrivia…
Exchange of information between system and environment: facts and myths
Filip A. Wudarski, Francesco Petruccione
The exchange of "information" between a system and its environment based on the reduced dynamics is investigated. The association of trace distance with information cannot be state…
On admissible memory kernels for random unitary qubit evolution
Filip A. Wudarski, Paweł Należyty, Gniewomir Sarbicki +1
We analyze random unitary evolution of the qubit within memory kernel approach. We provide sufficient conditions which guarantee that the corresponding memory kernel generates phys…