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10-01-2023
Gravitationally invariant subspaces in quantum computing
Published in: Natural Computing
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Abstract
Quantum information systems are fragile and highly susceptible to the deleterious effects of environmental noise. One noise source is due to the direct coupling of a massive spin-based quantum system and classical gravitational fields, which will rotate the spin of a system. Accounting for this rotation, called the Wigner rotation, is extremely difficult, and its effect is cumulative for even the most basic operations in quantum computation. However, by embedding the computation into a slightly larger system, we can avoid the decoherence caused by gravity. Additionally, we show that asymptotically in this embedding, the ratio of usable qubits to the entire system is one. While this method is demonstrated for the Wigner rotation, it would apply to any noisy unitary operator that uniformly rotates multi-qubit states in a similar way to the Wigner rotation.