Multispin Clifford codes for angular momentum errors in spin systems

Abstract

The physical symmetries of a system play a central role in quantum error correction. In this work we encode a qubit in a collection of systems with angular-momentum symmetry (spins), extending the tools developed in Phys. Rev. Lett. 127, 010504 for single large spins. By considering large spins present in atomic systems and focusing on their collective symmetric subspace, we develop new codes with octahedral symmetry capable of correcting errors up to second order in angular-momentum operators. These errors include the most physically relevant noise sources such as microwave control errors and optical pumping. We additionally explore new qubit codes that exhibit distance scaling commensurate with the surface code while permitting transversal single-qubit Clifford operations.

arXiv commentMinor corrections on the previous version

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• Superselection rules and bosonic quantum computational resources
• Dynamical decoupling of interacting spins through group factorization
• Tessellation codes: encoded quantum gates by geometric rotation
• Quantum error correction beyond $SU(2)$: spin, bosonic, and permutation-invariant codes from convex geometry
• Coherent Generation and Protection of Anticoherent Spin States
• Flexible Fault Tolerant Gate Gadgets
• Fault-Tolerant Encoding of Logical Qudits in Spin Systems