Fault-tolerant, error-corrected quantum computation is commonly acknowledged to be crucial to the realisation of large-scale quantum algorithms that could lead to extremely impactful scientific or commercial results.

In a recent release from the Centre for Quantum Computation and Communication Technology’s (CQC2T) University of Technology, Sydney node in Physical Review Research, researchers introduce a very simple protocol to potentially reduce the overhead for non-Clifford gates: Transversal Injection. 

Quantum computers are prone to noise and to run large scale algorithms we need some level of error correction. A well-studied method of doing this is using the surface code, a quantum error correcting code that works on a 2D grid of qubits.

In the surface code, we can apply certain gates fault-tolerantly with ease. However, for universal quantum computation, we also need access to a family of gates called non-Clifford gates. Transversal Injection is a new method of preparing the resources required for non-Clifford gates directly in the surface code and has the potential to reduce the number of qubits required for running large scale algorithms.

CQC2T ‘s UTS node’s core focus is Quantum Algorithms and Complexity and is led by Professor Mick Bremner.

Transversal injection for direct encoding of ancilla states for non-Clifford gates using stabilizer codes
Jason Gavriel, Daniel Herr, Alexis Shaw, Michael J. Bremner, Alexandru Paler, and Simon J. Devitt
Physical Review Research 5, 3, (2023)

Jason Gavriel, University of Technology, Sydney