153 citations · 522 across the 20 of their papers we have counts for
21 papers
The effects of shot noise on the quantum computation of NMR spectra
Sebastian Walch, Keith R. Fratus, Jan-Michael Reiner +1
Recent advances in the field of quantum computing hardware motivate the search for applications which demonstrate so-called quantum advantage. One promising use case that has been…
Can a Quantum Computer Simulate Nuclear Magnetic Resonance Spectra Better than a Classical One?
Keith R. Fratus, Nicklas Enenkel, Sebastian Zanker +3
The simulation of the spectra measured in nuclear magnetic resonance (NMR) spectroscopy experiments is a computationally non-trivial problem which, due to its natural interpretatio…
Quantum algorithms for simulating systems coupled to bosonic modes using a hybrid resonator-qubit quantum computer
Juha Leppäkangas, Pascal Stadler, Dmitry Golubev +14
Modeling composite systems of spins or electrons coupled to bosonic modes is of significant interest for many fields of applied quantum physics and chemistry. A quantum simulation…
The Discrete Noise Approximation in Quantum Circuits
Keith R. Fratus, Juha Leppäkangas, Michael Marthaler +1
When modeling the effects of noise on quantum circuits, one often makes the assumption that these effects can be accounted for by individual decoherence events following an otherwi…
The domain wall color code
Konstantin Tiurev, Arthur Pesah, Peter-Jan H. S. Derks +4
We introduce the domain wall color code, a new variant of the quantum error-correcting color code that exhibits exceptionally high code-capacity error thresholds for qubits subject…
Post-processing noisy quantum computations utilizing N-representability constraints
Tomislav Piskor, Florian G. Eich, Michael Marthaler +2
We propose and analyze a method for improving quantum chemical energy calculations on a quantum computer impaired by decoherence and shot noise. The error mitigation approach relie…
A quantum algorithm for solving open system dynamics on quantum computers using noise
Juha Leppäkangas, Nicolas Vogt, Keith R. Fratus +6
In this paper we present a quantum algorithm that uses noise as a resource. The goal of our quantum algorithm is the calculation of operator averages of an open quantum system evol…
Describing Trotterized Time Evolutions on Noisy Quantum Computers via Static Effective Lindbladians
Keith R. Fratus, Kirsten Bark, Nicolas Vogt +4
We consider the extent to which a Trotterized time evolution implemented on a quantum computer is altered by the presence of decoherence. Given a specific set of assumptions regard…
Correcting non-independent and non-identically distributed errors with surface codes
Konstantin Tiurev, Peter-Jan H. S. Derks, Joschka Roffe +2
A common approach to studying the performance of quantum error correcting codes is to assume independent and identically distributed single-qubit errors. However, the available exp…
Using gradient-based algorithms to determine ground state energies on a quantum computer
Tomislav Piskor, Florian G. Eich, Jan-Michael Reiner +4
Variational algorithms are promising candidates to be implemented on near-term quantum computers. The variational quantum eigensolver (VQE) is a prominent example, where a parametr…
Topological-Graph Dependencies and Scaling Properties of a Heuristic Qubit-Assignment Algorithm
Matthew Steinberg, Sebastian Feld, Carmen G. Almudever +2
The qubit-mapping problem aims to assign and route qubits of a quantum circuit onto a NISQ device in an optimized fashion, with respect to some cost function. Finding an optimal so…
Observation of separated dynamics of charge and spin in the Fermi-Hubbard model
Frank Arute, Kunal Arya, Ryan Babbush +96
Strongly correlated quantum systems give rise to many exotic physical phenomena, including high-temperature superconductivity. Simulating these systems on quantum computers may avo…
Preparing symmetry broken ground states with variational quantum algorithms
Nicolas Vogt, Sebastian Zanker, Jan-Michael Reiner +3
One of the most promising applications for near term quantum computers is the simulation of physical quantum systems, particularly many-electron systems in chemistry and condensed…
Finding the ground state of the Hubbard model by variational methods on a quantum computer with gate errors
Jan-Michael Reiner, Frank Wilhelm-Mauch, Gerd Schön +1
A key goal of digital quantum computing is the simulation of fermionic systems such as molecules or the Hubbard model. Unfortunately, for present and near-future quantum computers…
Effects of gate errors in digital quantum simulations of fermionic systems
Jan-Michael Reiner, Sebastian Zanker, Iris Schwenk +4
Digital quantum simulations offer exciting perspectives for the study of fermionic systems such as molecules or lattice models. However, with quantum error correction still being o…
Quantum simulation of the spin-boson model with a microwave circuit
Juha Leppäkangas, Jochen Braumüller, Melanie Hauck +7
We consider superconducting circuits for the purpose of simulating the spin-boson model. The spin-boson model consists of a single two-level system coupled to bosonic modes. In mos…
Analyzing the spectral density of a perturbed analog quantum simulator using Keldysh formalism
Sebastian Zanker, Iris Schwenk, Jan-Michael Reiner +2
Simulation of interacting electron systems is one of the great challenges of modern quantum chemistry and solid state physics. Controllable quantum systems offer the opportunity to…
Reconstructing the ideal results of a perturbed analog quantum simulator
Iris Schwenk, Jan-Michael Reiner, Sebastian Zanker +3
Well-controlled quantum systems can potentially be used as quantum simulators. However, a quantum simulator is inevitably perturbed by coupling to additional degrees of freedom. Th…
Estimating the error of an analog quantum simulator by additional measurements
Iris Schwenk, Sebastian Zanker, Jan-Michael Reiner +2
We study an analog quantum simulator coupled to a reservoir with a known spectral density. The reservoir perturbs the quantum simulation by causing decoherence. The simulator is us…
Emulating the one-dimensional Fermi-Hubbard model by a double chain of qubits
Jan-Michael Reiner, Michael Marthaler, Jochen Braumüller +2
The Jordan-Wigner transformation maps a one-dimensional spin-1/2 system onto a fermionic model without spin degree of freedom. A double chain of quantum bits with XX and ZZ couplin…
Implementation of a Quantum Metamaterial
Pascal Macha, Gregor Oelsner, Jan-Michael Reiner +7
Manipulating the propagation of electromagnetic waves through sub-wavelength sized artificial structures is the core function of metamaterials. Resonant structures, such as split r…