Representations of the multi-qubit Clifford group
Jonas Helsen (TU Delft - QuTech Advanced Research Centre, TU Delft - Quantum Information and Software)
Joel J. Wallman (University of Waterloo)
Stephanie Wehner (TU Delft - Quantum Information and Software, TU Delft - Quantum Internet Division, TU Delft - QuTech Advanced Research Centre)
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Abstract
The q-qubit Clifford group, that is, the normalizer of the q-qubit Pauli group in U(2q), is a fundamental structure in quantum information with a wide variety of applications. We characterize all irreducible subrepresentations of the two-copy representation φ⊗2 of the Clifford group on the two-fold tensor product of the space of linear operators M2q⊗2. In the companion paper [Helsen et al., e-print arXiv:1701.04299 (2017)], we apply this result to improve the statistics of randomized benchmarking, a method for characterizing quantum systems.