Implementing a strand of a scalable fault-tolerant quantum computing fabric.

Abstract:

:With favourable error thresholds and requiring only nearest-neighbour interactions on a lattice, the surface code is an error-correcting code that has garnered considerable attention. At the heart of this code is the ability to perform a low-weight parity measurement of local code qubits. Here we demonstrate high-fidelity parity detection of two code qubits via measurement of a third syndrome qubit. With high-fidelity gates, we generate entanglement distributed across three superconducting qubits in a lattice where each code qubit is coupled to two bus resonators. Via high-fidelity measurement of the syndrome qubit, we deterministically entangle the code qubits in either an even or odd parity Bell state, conditioned on the syndrome qubit state. Finally, to fully characterize this parity readout, we develop a measurement tomography protocol. The lattice presented naturally extends to larger networks of qubits, outlining a path towards fault-tolerant quantum computing.

journal_name

Nat Commun

journal_title

Nature communications

authors

Chow JM,Gambetta JM,Magesan E,Abraham DW,Cross AW,Johnson BR,Masluk NA,Ryan CA,Smolin JA,Srinivasan SJ,Steffen M

doi

10.1038/ncomms5015

subject

Has Abstract

pub_date

2014-06-24 00:00:00

pages

4015

issn

2041-1723

pii

ncomms5015

journal_volume

5

pub_type

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