Condensed Matter Seminar: Fault-tolerant measurement of a quantum error syndrome

Dr. Serge Rosenblum, Yale University

11 January 2018, 13:00 
Shenkar Physics Building, Room 222 
Condensed Matter Seminar

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.

 

 

Event Organizer: Dr. Roni Ilan

Tel Aviv University makes every effort to respect copyright. If you own copyright to the content contained
here and / or the use of such content is in your opinion infringing, Contact us as soon as possible >>