Papers
Live trends in quantum computing research, updated daily from arXiv.
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Tuning Quantum Computing Privacy through Quantum Error Correction
Hui Zhong, Keyi Ju, Manojna Sistla +4 more·Dec 22, 2023
Quantum computing is a promising paradigm for efficiently solving large and high-complexity problems. However, ensuring privacy within this quantum computing necessitates innovative approaches. Existing research has introduced the concept of quantum ...
Occupation-number quantum-subspace-expansion approach to computing the single-particle Green function: An opportunity for noise filtering
B. Gauthier, P. Rosenberg, A. Foley +1 more·Dec 21, 2023
We introduce a hybrid quantum-classical algorithm to compute the Green function for strongly correlated electrons on noisy intermediate-scale quantum (NISQ) devices. The technique consists in the construction of a non-orthogonal excitation basis comp...
Scalable Full-Stack Benchmarks for Quantum Computers
Jordan Hines, Timothy Proctor·Dec 21, 2023
Quantum processors are now able to run quantum circuits that are infeasible to simulate classically, creating a need for benchmarks that assess a quantum processor's rate of errors when running these circuits. Here, we introduce a general technique f...
Adaptive variational low-rank dynamics for open quantum systems
Luca Gravina, Vincenzo Savona·Dec 21, 2023
We introduce a novel, model-independent method for the efficient simulation of low-entropy systems, whose dynamics can be accurately described with a limited number of states. Our method leverages the time-dependent variational principle to efficient...
Scalable simulation of nonequilibrium quantum dynamics via classically optimized unitary circuits
Luke Causer, Felix Jung, Asimpunya Mitra +2 more·Dec 21, 2023
The advent of near-term digital quantum computers could offer us an exciting opportunity to investigate quantum many-body phenomena beyond that of classical computing. To make the best use of the hardware available, it is paramount that we have metho...
Which Options Exist for NISQ-Friendly Linear Response Formulations?
K. M. Ziems, E. Kjellgren, Peter Reinholdt +4 more·Dec 21, 2023
Linear response (LR) theory is a powerful tool in classic quantum chemistry crucial to understanding photoinduced processes in chemistry and biology. However, performing simulations for large systems and in the case of strong electron correlation rem...
First-order phase transition of the Schwinger model with a quantum computer
Takis Angelides, Pranay Naredi, Arianna Crippa +4 more·Dec 20, 2023
We explore the first-order phase transition in the lattice Schwinger model in the presence of a topological θ-term by means of the variational quantum eigensolver (VQE). Using two different fermion discretizations, Wilson and staggered fermions, we d...
Improving fidelity of multi-qubit gates using hardware-level pulse parallelization
S. Pratapsi, Diogo Cruz·Dec 20, 2023
Quantum computation holds the promise of solving computational problems which are believed to be classically intractable. However, in practice, quantum devices are still limited by their relatively short coherence times and imperfect circuit-hardware...
Deterministic Ansätze for the measurement-based variational quantum eigensolver
Anna Schroeder, Matthias Heller, Mariami Gachechiladze·Dec 20, 2023
Measurement-based quantum computing (MBQC) is a promising approach to reducing circuit depth in noisy intermediate-scale quantum algorithms such as the variational quantum eigensolver (VQE). Unlike gate-based computing, MBQC employs local measurement...
Quantum Equation of Motion with Orbital Optimization for Computing Molecular Properties in Near-Term Quantum Computing.
Phillip W K Jensen, E. Kjellgren, Peter Reinholdt +4 more·Dec 19, 2023
Determining the properties of molecules and materials is one of the premier applications of quantum computing. A major question in the field is how to use imperfect near-term quantum computers to solve problems of practical value. Inspired by the rec...
Toward coherent quantum computation of scattering amplitudes with a measurement-based photonic quantum processor
R. Briceño, Robert G. Edwards, M. Eaton +3 more·Dec 19, 2023
In recent years, applications of quantum simulation have been developed to study the properties of strongly interacting theories. This has been driven by two factors: on the one hand, needs from theorists to have access to physical observables that a...
Harnessing Inherent Noises for Privacy Preservation in Quantum Machine Learning
Keyi Ju, Xiaoqi Qin, Hui Zhong +3 more·Dec 18, 2023
Quantum computing revolutionizes the way of solving complex problems and handling vast datasets, which shows great potential to accelerate the machine learning process. However, data leakage in quantum machine learning (QML) may present privacy risks...
Fewer Measurements from Shadow Tomography with N-Representability Conditions.
Irma Avdic, D. Mazziotti·Dec 18, 2023
Classical shadow tomography provides a randomized scheme for approximating the quantum state and its properties at reduced computational cost with applications in quantum computing. In this Letter we present an algorithm for realizing fewer measureme...
Strategies for simulating time evolution of Hamiltonian lattice field theories
Siddharth Hariprakash, Neel S. Modi, Michael Kreshchuk +2 more·Dec 18, 2023
Simulating the time evolution of quantum field theories given some Hamiltonian $H$ requires developing algorithms for implementing the unitary operator e^{-iHt}. A variety of techniques exist that accomplish this task, with the most common technique ...
Incoherent approximation of leakage in quantum error correction
Jeffrey Marshall, D. Kafri·Dec 16, 2023
Quantum error correcting codes typically do not account for quantum state transitions - leakage - out of the computational subspace. Since these errors can last for multiple detection rounds they can significantly contribute to logical errors. It is ...
Learning, Optimizing, and Simulating Fermions with Quantum Computers
Andrew Zhao·Dec 16, 2023
Fermions are fundamental particles which obey seemingly bizarre quantum-mechanical principles, yet constitute all the ordinary matter that we inhabit. As such, their study is heavily motivated from both fundamental and practical incentives. In this d...
Accurate and gate-efficient quantum Ansätze for electronic states without adaptive optimization
Hugh G. A. Burton·Dec 15, 2023
The ability of quantum computers to overcome the exponential memory scaling of many-body problems is expected to transform quantum chemistry. Quantum algorithms require accurate representations of electronic states on a quantum device, but current ap...
Efficient quantum simulation of nonlinear interactions using SNAP and Rabi gates
Kimin Park, P. Marek, R. Filip·Dec 15, 2023
Quantum simulations provide means to probe challenging problems within controllable quantum systems. However, implementing or simulating deep-strong nonlinear couplings between bosonic oscillators on physical platforms remains a challenge. We present...
Demonstration of Fault-Tolerant Steane Quantum Error Correction
L. Postler, Friederike Butt, Ivan Pogorelov +7 more·Dec 15, 2023
Encoding information redundantly using quantum error-correcting (QEC) codes allows one to overcome the inherent sensitivity to noise in quantum computers to ultimately achieve large-scale quantum computation. The Steane QEC method involves preparing ...
Quantum algorithm for solving the advection equation using Hamiltonian simulation
Peter Brearley, Sylvain Laizet·Dec 15, 2023
A quantum algorithm for solving the advection equation by embedding the discrete time-marching operator into Hamiltonian simulations is presented. One-dimensional advection can be simulated directly since the central finite-difference operator for fi...