Austin Fowler

Qubit Metrology of Ultralow Phase Noise Using Randomized Benchmarking

PJJ O'Malley, J Kelly, R Barends, B Campbell, Y Chen, Z Chen, B Chiaro, A Dunsworth, AG Fowler, I-C Hoi, E Jeffrey, A Megrant, J Mutus, C Neill, C Quintana, P Roushan, D Sank, A Vainsencher, J Wenner, TC White, et al.

Journal article  |  2015  |  PHYSICAL REVIEW APPLIED

A precise measurement of dephasing over a range of time scales is critical for improving quantum gates beyond the error correction..

State preservation by repetitive error detection in a superconducting quantum circuit

J Kelly, R Barends, AG Fowler, A Megrant, E Jeffrey, TC White, D Sank, JY Mutus, B Campbell, Yu Chen, Z Chen, B Chiaro, A Dunsworth, I-C Hoi, C Neill, PJJ O'Malley, C Quintana, P Roushan, A Vainsencher, J Wenner, et al.

Journal article  |  2015  |  NATURE

Quantum computing becomes viable when a quantum state can be protected from environment-induced error. If quantum bits (qubits) ar..

Leakage-resilient approach to fault-tolerant quantum computing with superconducting elements

Joydip Ghosh, Austin G Fowler

Journal article  |  2015  |  PHYSICAL REVIEW A

Superconducting qubits, while promising for scalability and long coherence times, contain more than two energy levels, and therefo..

MINIMUM WEIGHT PERFECT MATCHING OF FAULT-TOLERANT TOPOLOGICAL QUANTUM ERROR CORRECTION IN AVERAGE O(1) PARALLEL TIME

Austin G Fowler

Journal article  |  2015  |  QUANTUM INFORMATION & COMPUTATION

Consider a 2-D square array of qubits of extent L × L. We provide a proof that the minimum weight perfect matching problem associa..

Upper bound for loss in practical topological-cluster-state quantum computing

Adam C Whiteside, Austin G Fowler

Journal article  |  2014  |  PHYSICAL REVIEW A

The surface code cannot be used when qubits vanish during computation; instead, a variant known as the topological cluster state i..

Rolling quantum dice with a superconducting qubit

R Barends, J Kelly, A Veitia, A Megrant, AG Fowler, B Campbell, Y Chen, Z Chen, B Chiaro, A Dunsworth, I-C Hoi, E Jeffrey, C Neill, PJJ O'Malley, J Mutus, C Quintana, P Roushan, D Sank, J Wenner, TC White, et al.

Journal article  |  2014  |  PHYSICAL REVIEW A

One of the key challenges in quantum information is coherently manipulating the quantum state. However, it is an outstanding quest..

Optimal Quantum Control Using Randomized Benchmarking

J Kelly, R Barends, B Campbell, Y Chen, Z Chen, B Chiaro, A Dunsworth, AG Fowler, I-C Hoi, E Jeffrey, A Megrant, J Mutus, C Neill, PJJ O'Malley, C Quintana, P Roushan, D Sank, A Vainsencher, J Wenner, TC White, et al.

Journal article  |  2014  |  PHYSICAL REVIEW LETTERS

We present a method for optimizing quantum control in experimental systems, using a subset of randomized benchmarking measurements..

Superconducting quantum circuits at the surface code threshold for fault tolerance

R Barends, J Kelly, A Megrant, A Veitia, D Sank, E Jeffrey, TC White, J Mutus, AG Fowler, B Campbell, Y Chen, Z Chen, B Chiaro, A Dunsworth, C Neill, P O'Malley, P Roushan, A Vainsencher, J Wenner, AN Korotkov, et al.

Journal article  |  2014  |  NATURE

A quantum computer can solve hard problems, such as prime factoring, database searching and quantum simulation, at the cost of nee..

Quantifying the effects of local many-qubit errors and nonlocal two-qubit errors on the surface code

Austin G Fowler, John M Martinis

Journal article  |  2014  |  PHYSICAL REVIEW A

Topological quantum error correction codes are known to be able to tolerate arbitrary local errors given sufficient qubits. This i..

Coping with qubit leakage in topological codes

Austin G Fowler

Journal article  |  2013  |  PHYSICAL REVIEW A

Many physical systems considered promising qubit candidates are not, in fact, two-level systems. Such systems can leak out of the ..