IQI Weekly Seminar

Abstract: Reliable qubits are difficult to engineer, but standard fault-tolerance schemes use seven or more physical qubits to encode each logical qubit, with still more qubits required for error correction.  We give space-efficient methods for fault-tolerant error correction and computation.  For example, in a system with fewer than 20 qubits total, we can protect and compute fault tolerantly on seven encoded qubits.  Seven qubits suffice to protect one encoded qubit.  A main technique is to use gadgets to catch correlated faults.  The procedures could enable testing more sophisticated protected circuits in small-scale quantum devices.  

Joint work with Rui Chao.  arXiv:1705.02329 and 1705.05365.