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State preservation by repetitive error detection in a superconducting quantum circuit
J. Kelly, R. Barends, A. G. Fowler +19
Quantum computing becomes viable when a quantum state can be preserved from environmentally-induced error. If quantum bits (qubits) are sufficiently reliable, errors are sparse and…
Qubit metrology of ultralow phase noise using randomized benchmarking
P. J. J. O'Malley, J. Kelly, R. Barends +20
A precise measurement of dephasing over a range of timescales is critical for improving quantum gates beyond the error correction threshold. We present a metrological tool, based o…
Practical Topological Cluster State Quantum Computing Requires Loss Below 1%
Adam C. Whiteside, Austin G. Fowler
The surface code cannot be used when qubits vanish during computation; instead, a variant known as the topological cluster state is necessary. It has a gate error threshold of $0.7…
Resource comparison of two surface code implementations of small angle Z rotations
Prashant Mishra, Austin Fowler
Fault-tolerant Z rotations by pi/2^k are important as they arise in numerous quantum algorithms, most notably those involving quantum Fourier transforms. We describe surface code i…
Rolling quantum dice with a superconducting qubit
R. Barends, J. Kelly, A. Veitia +20
One of the key challenges in quantum information is coherently manipulating the quantum state. However, it is an outstanding question whether control can be realized with low error…
A leakage-resilient approach to fault-tolerant quantum computing with superconducting elements
Joydip Ghosh, Austin G. Fowler
Superconducting qubits, while promising for scalability and long coherence times, contain more than two energy levels, and therefore are susceptible to errors generated by the leak…