Yanan University Team Develops Nonadiabatic Holonomic Scheme for Robust Single-Qubit Gates

Three-level systems now achieve arbitrary single-qubit holonomic gates in a ‘no-jump’ regime, a key advance in quantum control. Wei Li and colleagues from Yanan University have developed a nonadiabatic holonomic scheme using a non-Hermitian Hamiltonian, overcoming limitations of previous methods that either ignored energy loss or were restricted to more complex four-level systems. The approach directly incorporates decay and dephasing, processes that disrupt quantum information, into the design of the control pulses, maintaining gate accuracy despite these effects. The team utilised a three-level system, employing carefully shaped control pulses to perform calculations despite the natural degradation of the system. By…