561 citations · 2k across the 24 of their papers we have counts for
24 papers
Encoding a magic state with beyond break-even fidelity
Riddhi S. Gupta, Neereja Sundaresan, Thomas Alexander +10
To run large-scale algorithms on a quantum computer, error-correcting codes must be able to perform a fundamental set of operations, called logic gates, while isolating the encoded…
Error mitigated quantum circuit cutting
Ritajit Majumdar, Christopher J. Wood
We investigate an error mitigated tomographic approach to the quantum circuit cutting problem in the presence of gate and measurement noise. We explore two tomography specific erro…
Algorithms for perturbative analysis and simulation of quantum dynamics
Daniel Puzzuoli, Sophia Fuhui Lin, Moein Malekakhlagh +3
We develop general purpose algorithms for computing and utilizing both the Dyson series and Magnus expansion, with the goal of facilitating numerical perturbative studies of quantu…
Scalable error mitigation for noisy quantum circuits produces competitive expectation values
Youngseok Kim, Christopher J. Wood, Theodore J. Yoder +4
Noise in existing quantum processors only enables an approximation to ideal quantum computation. However, these approximations can be vastly improved by error mitigation, for the c…
Experimental Bayesian estimation of quantum state preparation, measurement, and gate errors in multi-qubit devices
Haggai Landa, Dekel Meirom, Naoki Kanazawa +2
We introduce a Bayesian method for the estimation of single qubit errors in quantum devices, and use it to characterize these errors on three 27-qubit superconducting qubit devices…
Measurement Error Mitigation for Variational Quantum Algorithms
George S. Barron, Christopher J. Wood
Variational Quantum Algorithms (VQAs) are a promising application for near-term quantum processors, however the quality of their results is greatly limited by noise. For this reaso…
Demonstration of quantum volume 64 on a superconducting quantum computing system
Petar Jurcevic, Ali Javadi-Abhari, Lev S. Bishop +28
We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume, with a combination of dynamical decoupling, compiler opt…
Experimental implementation of non-Clifford interleaved randomized benchmarking with a controlled-S gate
Shelly Garion, Naoki Kanazawa, Haggai Landa +4
Hardware efficient transpilation of quantum circuits to a quantum devices native gateset is essential for the execution of quantum algorithms on noisy quantum computers. Typical qu…
Quantum process tomography with unsupervised learning and tensor networks
Giacomo Torlai, Christopher J. Wood, Atithi Acharya +3
The impressive pace of advance of quantum technology calls for robust and scalable techniques for the characterization and validation of quantum hardware. Quantum process tomograph…
Qiskit Pulse: Programming Quantum Computers Through the Cloud with Pulses
Thomas Alexander, Naoki Kanazawa, Daniel J. Egger +4
The quantum circuit model is an abstraction that hides the underlying physical implementation of gates and measurements on a quantum computer. For precise control of real quantum h…
Correlated Randomized Benchmarking
David C. McKay, Andrew W. Cross, Christopher J. Wood +1
To improve the performance of multi-qubit algorithms on quantum devices it is critical to have methods for characterizing non-local quantum errors such as crosstalk. To address thi…
Qiskit Backend Specifications for OpenQASM and OpenPulse Experiments
David C. McKay, Thomas Alexander, Luciano Bello +17
As interest in quantum computing grows, there is a pressing need for standardized API's so that algorithm designers, circuit designers, and physicists can be provided a common refe…
Quantification and Characterization of Leakage Errors
Christopher J. Wood, Jay M. Gambetta
We present a general framework for the quantification and characterization of leakage errors that result when a quantum system is encoded in the subspace of a larger system. To do…
Efficient Z-Gates for Quantum Computing
David C. McKay, Christopher J. Wood, Sarah Sheldon +2
For superconducting qubits, microwave pulses drive rotations around the Bloch sphere. The phase of these drives can be used to generate zero-duration arbitrary "virtual" Z-gates wh…
Spin-Orbit States of Neutron Wavepackets
Joachim Nsofini, Dusan Sarenac, Christopher J. Wood +5
We propose a method to prepare an entangled spin-orbit state between the spin and the orbital angular momenta of a neutron wavepacket. This spin-orbit state is created by passing n…
Cavity cooling to the ground state of an ensemble quantum system
Christopher J. Wood, David G. Cory
We describe a method for initializing an ensemble of qubits in a pure ground state by applying collective cavity cooling techniques in the presence of local dephasing noise on each…
Characterizing quantum dynamics with initial system-environment correlations
Martin Ringbauer, Christopher J. Wood, Kavan Modi +3
We fully characterize the reduced dynamics of an open quantum system initially correlated with its environment. Using a photonic qubit coupled to a simulated environment we tomogra…
Cavity cooling of an ensemble spin system
Christopher J. Wood, Troy W. Borneman, David G. Cory
We describe how sideband cooling techniques may be applied to large spin ensembles in magnetic resonance. Using the Tavis-Cummings model in the presence of a Rabi drive, we solve a…
Quantum correlations in a noisy neutron interferometer
Christopher J. Wood, David G. Cory, Mohamed O. Abutaleb +3
We investigate quantum coherences in the presence of noise by entangling the spin and path degrees of freedom of the output neutron beam from a noisy three-blade perfect crystal ne…
The lesson of causal discovery algorithms for quantum correlations: Causal explanations of Bell-inequality violations require fine-tuning
Christopher J. Wood, Robert W. Spekkens
An active area of research in the fields of machine learning and statistics is the development of causal discovery algorithms, the purpose of which is to infer the causal relations…
Tensor networks and graphical calculus for open quantum systems
Christopher J. Wood, Jacob D. Biamonte, David G. Cory
We describe a graphical calculus for completely positive maps and in doing so review the theory of open quantum systems and other fundamental primitives of quantum information theo…
Quantum discord in quantum computation
Aharon Brodutch, Alexei Gilchrist, Daniel R. Terno +1
Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processi…
Non-completely positive maps: properties and applications
Christopher J. Wood
We investigate the evolution of open quantum systems in the presence of initial correlations with an environment. Here the standard formalism of describing evolution by completely…
Vectorization of quantum operations and its use
Alexei Gilchrist, Daniel R. Terno, Christopher J. Wood
We give a detailed exposition of the "vectorized" notation for dealing with quantum operations. This notation is used to highlight the relationships between representations of comp…