Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y41: Characterizing Large-Scale Quantum SystemsInvited
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Sponsoring Units: DQI Chair: Carlton Caves, Univ of New Mexico Room: LACC 502A |
Friday, March 9, 2018 11:15AM - 11:51AM |
Y41.00001: How do we verify and validate a quantum computer? Invited Speaker: Sarah Sheldon As superconducting qubit devices increase in coherence and size, the idea of quantum computing becomes more tangible. However, this also raises new issues as standard methods for characterizing small scale devices are insufficient. Randomized benchmarking and tomographic techniques are essential tools for verifying one- and two-qubit gates, but have limited practicality in large systems. Techniques that ignore neighboring qubits are blind to potential crosstalk terms and miss important errors that could be present in multi-qubit quantum circuits and, crucially, could impact error correction codes. This talk will discuss a variety of methods for verifying and validating multi-qubit devices, with a particular emphasis on crosstalk errors. State-of-the-art devices have single-qubit error rates lower than 10-3 and two-qubit error rates less than 10-2, but these error rates do not account for total errors found in algorithmic applications. Such errors can be studied using extensions to randomized benchmarking, small logical codes, and targeted error amplification sequences. Each of these techniques is designed to either identify an error, characterize that error, or to verify and validate operations after developing new calibration procedures. These steps combined make up our approach to improving quantum controls on superconducting qubit devices as we continually detect new errors and improve fidelity. |
Friday, March 9, 2018 11:51AM - 12:27PM |
Y41.00002: Characterization of Pauli Error Models Invited Speaker: Marcus da Silva While stochastic Pauli errors play an important role in modeling fault-tolerant architectures, such error models are usually dismissed as not being representative of errors found in physical systems. A recent experimental implementation of Pauli frame randomization, a technique to shape general error models into Pauli error models, demonstrates that these simple and highly structured error models are indeed experimentally relevant. In this talk I will describe a proposal to exploit the structure of Pauli error models on Clifford group operations to obtain simple and highly accurate reconstructions of noise models in randomized experiments. |
Friday, March 9, 2018 12:27PM - 1:03PM |
Y41.00003: Comparing experiments to the fault tolerance threshold Invited Speaker: Steven Flammia This abstract not available. |
Friday, March 9, 2018 1:03PM - 1:39PM |
Y41.00004: Cycle Benchmarking for Scalable Verification of Quantum Circuit Performance Invited Speaker: Joseph Emerson Predicting the reliability and capacity of quantum computer hardware, under some imperfectly known noise model, to perform a quantum computation, either with or without error correction, is a major challenge towards the realization of practical quantum computation. In this talk I will describe a practical framework, comprising randomized compiling and cycle benchmarking, which provides a complete and comprehensive solution to this problem. Randomized Compiling is a scalable method to dramatically reduce the most problematic errors affecting present-day quantum processors, including coherent (calibration) errors and non-Markovian errors, which tailors the error model to stochastic Pauli errors to very good approximation. Cycle benchmarking is a more efficient and practical method of randomized benchmarking which leverages randomized compiling to enable a precise and scalable method to bound the error probability of the quantum computer output for any algorithm or application based on a characterization of the actual error model affecting the hardware. These hardware-agnostic tools, which are available as a software system, imply a rigorous means of demonstrating quantum supremacy or quantum advantage in the regime beyond classically simulability. |
Friday, March 9, 2018 1:39PM - 2:15PM |
Y41.00005: Characterizing multi-qubit gates on an ion traps quantum computer Invited Speaker: Joel J. Wallman Multi-qubit gates allow complex dynamics to be generated in short quantum circuits, enabling lower total error rates. However, fully characterizing the performance of a multi-qubit gate is impractical for more than three qubits. In this talk, we present a method of efficiently estimating the average gate fidelity of the Molmer-Sorrenson gate and experimental estimates of the fidelity of global Molmer-Sorrenson gates acting on up to 10 trapped ions. |
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