10 citations · 24 across the 14 of their papers we have counts for
16 papers
Non-adiabatic Optimisation via Localisation-Delocalisation Transitions
Ryan Smith, Sabrina Yue Wang, Filippo Maria Gambetta +1
The promise of efficiently solving classical optimisation problems on quantum computers is tantalizing. As many such problems can be mapped to approximating the ground state of spi…
Maximum-Entropy Extension of Quantum Correlation Functions from Short Real-Time Dynamics
Filippo Maria Gambetta, Sabrina Yue Wang, Raul A. Santos
Correlation functions are central to understanding the behavior of quantum systems, with their spectra giving direct access to quasiparticle and collective excitations. However, th…
Time evolution of impurity models and their universality for quantum computation
N. C. Mai Pham, Raul A. Santos
Impurity Hamiltonians are systems of fermionic modes where of them interact among themselves via quartic (or higher order) fermion terms, while coupling quadratically wi…
On the stability to noise of fermion-to-qubit mappings
Guillermo González-García, Filippo Maria Gambetta, Raul A. Santos
Quantum simulations before fault tolerance suffer from the intrinsic noise present in quantum computers. In this regime, extracting meaningful results greatly benefits from stabili…
Onset of Ergodicity Across Scales on a Digital Quantum Processor
Faisal Alam, Marcos Crichigno, Elizabeth Crosson +7
Understanding how isolated quantum many-body systems thermalize remains a central question in modern physics. We study the onset of ergodicity in a two-dimensional disordered Heise…
Efficient classical simulation of time dynamics in Fermi-Hubbard models with imaginary interactions
Raul A. Santos
Using a map between the Lindbladian evolution of dephasing in free fermions and the time evolution of imaginary-interaction Fermi-Hubbard models in bipartite lattices, we present a…
Quantum algorithm for dephasing of coupled systems: decoupling and IQP duality
Sabrina Yue Wang, Raul A. Santos
Noise and decoherence are ubiquitous in the dynamics of quantum systems coupled to an external environment. In the regime where environmental correlations decay rapidly, the evolut…
Programmable digital quantum simulation of 2D Fermi-Hubbard dynamics using 72 superconducting qubits
Faisal Alam, Jan Lukas Bosse, Ieva Čepaitė +41
Simulating the time-dynamics of quantum many-body systems was the original use of quantum computers proposed by Feynman, motivated by the critical role of quantum interactions betw…
Fermionic dynamics on a trapped-ion quantum computer beyond exact classical simulation
Faisal Alam, Jan Lukas Bosse, Ieva Čepaitė +37
Simulation of the time-dynamics of fermionic many-body systems has long been predicted to be one of the key applications of quantum computers. Such simulations -- for which classic…
Improving time dynamics simulation by sampling the error unitary
Lana Mineh, Adrian Chapman, Raul A. Santos
We introduce an algorithm to improve the error scaling of product formulas by randomly sampling the generator of their exact error unitary. Our approach takes an arbitrary product…
Extracting the spin excitation spectrum of a fermionic system using a quantum processor
Lucia Vilchez-Estevez, Raul A. Santos, Sabrina Yue Wang +1
Understanding low-energy excitations in fermionic systems is crucial for their characterization. They determine the response of the system to external weak perturbations, its dynam…
Approximating dynamical correlation functions with constant depth quantum circuits
Reinis Irmejs, Raul A. Santos
One of the most important quantities characterizing the microscopic properties of quantum systems are dynamical correlation functions. These correlations are obtained by time-evolv…
How pure can we go with adiabatic state manipulation?
Raul A. Santos, Alex Kamenev, Yuval Gefen
Dissipative systems with decoherence free subspaces, a.k.a. dark spaces (DSs), can be used to protect quantum information. At the same time, dissipation is expected to give rise to…
Unveiling quantum phase transitions from traps in variational quantum algorithms
Chenfeng Cao, Filippo Maria Gambetta, Ashley Montanaro +1
Understanding quantum phase transitions in physical systems is fundamental to characterize their behavior at low temperatures. Achieving this requires both accessing good approxima…
Efficient and practical Hamiltonian simulation from time-dependent product formulas
Jan Lukas Bosse, Andrew M. Childs, Charles Derby +3
In this work we propose an approach for implementing time-evolution of a quantum system using product formulas. The quantum algorithms we develop have provably better scaling (in t…
Enhancing density functional theory using the variational quantum eigensolver
Evan Sheridan, Lana Mineh, Raul A. Santos +1
Quantum computers open up new avenues for modelling the physical properties of materials and molecules. Density Functional Theory (DFT) is the gold standard classical algorithm for…