Jens Eisert

Measurement-induced noncommutativity in adaptive fermionic linear optics

Fermionic linear optics (FLO) with Gaussian resources is known to be efficiently classically simulable. We show that this changes for fermions with internal degrees of freedom once the circuit is equipped with mid-circuit number monitoring and classical feedforward. In our archit...

Planar low-overhead quantum memories with only nearest-neighbour gates

Abstract High-performance quantum low-density parity-check codes promise substantial reductions in the overhead of fault-tolerant quantum computation, but most constructions require long-range connectivity or qubit shuttling, both of which are difficult to realise in superconduct...