RWTH researchers, together with colleagues from the University of Basel and TU Delft, have now designed a superconducting circuit that could accelerate the realization of a fault-tolerant quantum computer. Professor David DiVincenzo and Martin Rymarz from the RWTH Chair of Theoretical Physics were involved in this project. DiVincenzo is also director of the JARA Institute for Quantum Information and the Institute for Theoretical Nanoelectronics at Forschungszentrum Jülich. They both also conduct research in the Matter and Light for Quantum Information (ML4Q) Cluster of Excellence.
Building a universal quantum computer is a challenging endeavor due to the susceptibility of failure of quantum bits, or qubits. To contain this problem, quantum error-correcting (QEC) codes that can reliably encode quantum information have been developed. Conventional QEC codes do this by combining multiple imperfect qubits to encode a logical qubit that offers improved features and better performance. Such codes are usually based on complicated active protocols that require a great hardware investment. The new strategy bypasses the need for active stabilization and promises the desired benefits of QEC codes in a manner that is highly efficient when it comes to hardware usage. This built-in feature thus encodes a qubit that is inherently protected against environmental interference yet controllable, making it a competitive contender for a qubit of future large-scale quantum processors.
Source: “New Superconducting Circuit Could Accelerate Realization of Fault-Tolerant Quantum Computer”, RWTH Aachen