Chris Quintana
A5042184175- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Innovative Teaching and Learning Methods
- Mobile Learning in Education
- Quantum many-body systems
- Advancements in Semiconductor Devices and Circuit Design
- Physics of Superconductivity and Magnetism
- Online and Blended Learning
- Teaching and Learning Programming
- Science Education and Pedagogy
- Quantum Mechanics and Applications
- Semiconductor materials and devices
- Particle accelerators and beam dynamics
- Neural Networks and Reservoir Computing
- Online Learning and Analytics
- Educational Games and Gamification
- Visual and Cognitive Learning Processes
- Education and Technology Integration
- Quantum-Dot Cellular Automata
- Educational Strategies and Epistemologies
- E-Learning and Knowledge Management
- Semiconductor Quantum Structures and Devices
- Usability and User Interface Design
- Cold Atom Physics and Bose-Einstein Condensates
Google (United States)
2017-2024
University of Michigan
2013-2023
Michigan Department of Education
2023
Michigan United
2023
University of California, Riverside
2022
The University of Texas at El Paso
1992-2021
University of California, Santa Barbara
2014-2018
Universidad de Las Palmas de Gran Canaria
2017
Ruhr University Bochum
2014
National Kaohsiung Normal University
2009
We report the first electronic structure calculation performed on a quantum computer without exponentially costly precompilation. use programmable array of superconducting qubits to compute energy surface molecular hydrogen using two distinct algorithms. First, we experimentally execute unitary coupled cluster method variational eigensolver. Our efficient implementation predicts correct dissociation within chemical accuracy numerically exact result. Second, demonstrate canonical algorithm...
The notion of scaffolding learners to help them succeed in solving problems otherwise too difficult for is an important idea that has extended into the design scaffolded software tools learners. However, although there a growing body work on tools, scaffold design, and impact scaffolding, field not yet converged common theoretical framework defines rationales approaches guide tools. In this article, we present addressing science inquiry. Developed through iterative cycles inductive...
As the search continues for useful applications of noisy intermediate scale quantum devices, variational simulations fermionic systems remain one most promising directions. Here, we perform a series chemistry largest which involved dozen qubits, 78 two-qubit gates, and 114 one-qubit gates. We model binding energy ${\rm H}_6$, H}_8$, H}_{10}$ H}_{12}$ chains as well isomerization diazene. also demonstrate error-mitigation strategies based on $N$-representability dramatically improve effective...
A key step toward demonstrating a quantum system that can address difficult problems in physics and chemistry will be performing computation beyond the capabilities of any classical computer, thus achieving so-called supremacy. In this study, we used nine superconducting qubits to demonstrate promising path By individually tuning qubit parameters, were able generate thousands distinct Hamiltonian evolutions probe output probabilities. The measured probabilities obey universal distribution,...
Putting photons to work Interacting quantum particles can behave in peculiar ways. To understand that behavior, physicists have turned simulation, which a tunable and clean system be monitored as it evolves under the influence of interactions. Roushan et al. used chain nine superconducting qubits create effective interactions between normally noninteracting directly measured energy levels their system. The interplay disorder gave rise transition localized state. With an increase number...
The discovery of topological order has revolutionized the understanding quantum matter in modern physics and provided theoretical foundation for many error correcting codes. Realizing topologically ordered states proven to be extremely challenging both condensed synthetic systems. Here, we prepare ground state toric code Hamiltonian using an efficient circuit on a superconducting processor. We measure entanglement entropy near expected value $\ln2$, simulate anyon interferometry extract...
Simulating quantum physics with a device which itself is mechanical, notion Richard Feynman originated, would be an unparallelled computational resource. However, the universal simulation of fermionic systems daunting due to their particle statistics, and left as open question whether it could done, because need for non-local control. Here, we implement interactions digital techniques in superconducting circuit. Focusing on Hubbard model, perform time evolution constant well dynamic phase...
Realizing the potential of quantum computing requires sufficiently low logical error rates1. Many applications call for rates as 10-15 (refs. 2-9), but state-of-the-art platforms typically have physical near 10-3 10-14). Quantum correction15-17 promises to bridge this divide by distributing information across many qubits in such a way that errors can be detected and corrected. Errors on encoded qubit state exponentially suppressed number grows, provided are below certain threshold stable...
Superconducting qubits are an attractive platform for quantum computing since they have demonstrated high-fidelity gates and extensibility to modest system sizes. Nonetheless, outstanding challenge is stabilizing their energy-relaxation times, which can fluctuate unpredictably in frequency time. Here, we use as spectral temporal probes of individual two-level-system defects provide direct evidence that responsible the largest fluctuations. This research lays foundation qubit performance...
Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. However, any near-term realizations of these will need to be optimized fit within the finite resources offered by existing noisy hardware. Here, taking advantage adjustable coupling gmon qubits, we demonstrate continuous two-qubit gate set that can provide threefold reduction circuit depth as compared standard decomposition. We implement two families: an imaginary swap-like (iSWAP-like)...
Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states 1 . However, much of nature is not thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium can exhibit novel dynamical phases 2–8 may otherwise be forbidden by thermodynamics, a paradigmatic example being the discrete time crystal (DTC) 7,9–15 Concretely, defined periodically driven many-body-localized (MBL) via concept eigenstate order 7,16,17 In...
Interaction in quantum systems can spread initially localized information into the many degrees of freedom entire system. Understanding this process, known as scrambling, is key to resolving various conundrums physics. Here, by measuring time-dependent evolution and fluctuation out-of-time-order correlators, we experimentally investigate dynamics scrambling on a 53-qubit processor. We engineer circuits that distinguish two mechanisms associated with operator spreading entanglement, observe...
Leakage errors occur when a quantum system leaves the two-level qubit subspace. Reducing these is critically important for error correction to be viable. To quantify leakage errors, we use randomized benchmarking in conjunction with measurement of population. We characterize single gates superconducting qubit, and by refining our derivative reduction adiabatic gate pulse shaping along detuning pulses, obtain consistently below 10^{-3} rates at 10^{-5} level. With control optimized, find that...
We present a method for optimizing quantum control in experimental systems, using subset of randomized benchmarking measurements to rapidly infer error. This is demonstrated improve single- and two-qubit gates, minimize gate bleedthrough, where mechanism can cause errors on subsequent identify crosstalk superconducting qubits. able correct parameters so that no longer dominate suitable automated closed-loop optimization systems.
Many superconducting qubit systems use the dispersive interaction between and a coupled harmonic resonator to perform quantum state measurement. Previous works have found that such measurements can induce transitions in if number of photons is too high. We investigate these find they push out two-level subspace, show resonant behavior as function photon number. develop theory for observations based on level crossings within Jaynes-Cummings ladder, with mediated by terms Hamiltonian are...
Major educational policy groups call on learners to engage in inquiry-based activities. With a growing amount of information now available online, there is an increased focus online inquiry where ask research questions; search digital libraries and other sources; read, assess, synthesize that information. Metacognitive skills are important for engaging complex practices like inquiry, but those weak novice learners. In this article, we propose framework describes the types metacognitive...