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Fault-tolerant fermionic quantum computing

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arxiv 2411.08955 v2 pith:SBFOKHE2 submitted 2024-11-13 quant-ph cond-mat.mtrl-scicond-mat.quant-gascond-mat.str-elnucl-th

classification quant-phcond-mat.mtrl-scicond-mat.quant-gascond-mat.str-elnucl-th
keywords fermionicquantumfault-tolerantatomsdepthgatesintroducematerials
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Simulating the dynamics of electrons and other fermionic particles in quantum chemistry, materials science, and high-energy physics is one of the most promising applications of fault-tolerant quantum computers. However, the overhead in mapping time evolution under fermionic Hamiltonians to qubit gates renders this endeavor challenging. We introduce fermionic fault-tolerant quantum computing, a framework which removes this overhead altogether. Using native fermionic operations we first construct a repetition code which corrects phase errors only. Within a fermionic color code, which corrects for both phase and loss errors, we then realize a universal fermionic gate set, including transversal fermionic Clifford gates. Interfacing with qubit color codes we introduce qubit-fermion fault-tolerant computation, which allows for qubit-controlled fermionic time evolution, a crucial subroutine in state-of-the-art quantum algorithms. As an application, we consider simulating crystalline materials, finding an exponential improvement in circuit depth for a single time step from $\mathcal{O}(N)$ to $\mathcal{O}(\log(N))$ with respect to lattice site number $N$ while retaining a site count of $\tilde{\mathcal{O}}(N)$, implying a linear-in-$N$ end-to-end gate depth for simulating materials, as opposed to quadratic in previous approaches. We also introduce a fermion-inspired qubit algorithm with $O(\mathrm{log}(N)$ depth, but a prohibitive number of additional ancilla qubits. We show how our framework can be implemented in neutral atoms, overcoming the apparent inability of neutral atoms to implement non-number-conserving gates. Our work opens the door to fermion-qubit fault-tolerant quantum computation in platforms with native fermions such as neutral atoms, quantum dots and donors in silicon, with applications in quantum chemistry, material science, and high-energy physics.

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Cited by 11 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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    quant-ph 2025-08 conditional novelty 6.0 of 10

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  11. Microscopy of Ultracold Fermions in Optical Lattices

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    A lecture-note review of quantum gas microscope experiments on the Fermi-Hubbard model, covering magnetism, polarons, transport, new lattice geometries, and low-temperature entropy-redistribution protocols.

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