Increasing error tolerance in quantum computers with dynamic bias arrangement

Understand

Many quantum operations are expected to exhibit bias in the structure of their errors.

• Recent works have shown that a fixed bias can be exploited to improve error tolerance by statically arranging the errors in beneficial configurations.
• In some cases an error bias can be dynamically reconfigurable, an example being linear optical fusion where the basis of a fusion failure can be chosen before the measurement is made.
• Here we introduce methods for increasing error tolerance in this setting by using classical decision-making to adaptively choose the bias in measurements as a fault tolerance protocol proceeds.