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

Jerry M. Chow (), Jay M. Gambetta, Easwar Magesan, David W. Abraham, Andrew W. Cross, B R Johnson, Nicholas A. Masluk, Colm A. Ryan, John A. Smolin, Srikanth J. Srinivasan and M Steffen
Additional contact information
Jerry M. Chow: IBM T.J. Watson Research Center
Jay M. Gambetta: IBM T.J. Watson Research Center
Easwar Magesan: IBM T.J. Watson Research Center
David W. Abraham: IBM T.J. Watson Research Center
Andrew W. Cross: IBM T.J. Watson Research Center
B R Johnson: Raytheon BBN Technologies
Nicholas A. Masluk: IBM T.J. Watson Research Center
Colm A. Ryan: Raytheon BBN Technologies
John A. Smolin: IBM T.J. Watson Research Center
Srikanth J. Srinivasan: IBM T.J. Watson Research Center
M Steffen: IBM T.J. Watson Research Center

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5015

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