Fault tolerant measurement of a quantum error syndrome

by Serge Rosenblum

at Condensed Matter Seminar

Mon, 29 Jan 2018, 11:30
Physics building (#54) room 207

Abstract

Quantum error correction is a technique that can allow quantum computers to operate despite the presence of noise and imperfections A critical component of any error correcting scheme is the mapping of a quantum error syndrome onto an ancilla qubit However errors occurring in the ancilla can propagate through the mapping operation onto the logical qubit and irreversibly corrupt the encoded information A fault tolerant measurement protocol which prevents the occurrence of such uncorrectable errors is therefore a prerequisite for scaling up quantum error correction I will present our recent demonstration of the fault tolerant measurement of an error syndrome on a logical qubit encoded in a superconducting resonator We achieve fault tolerance hardware efficiently by coupling the logical qubit to a single multilevel ancilla transmon The cavity ancilla interaction is modified in situ using off resonant sideband drives to make the logical qubit transparent to all first order ancilla errors We achieve a sevenfold increase in the average number of syndrome measurements performed without destroying the logical qubit These results demonstrate that hardware efficient approaches which exploit system specific error models can yield practical advances towards fault tolerant quantum computation

Created on 21-01-2018 by Bar Lev, Yevgeny (ybarlev)
Updaded on 21-01-2018 by Bar Lev, Yevgeny (ybarlev)