Journal
PHYSICAL REVIEW RESEARCH
Volume 1, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.1.033033
Keywords
-
Categories
Funding
- IBM Research Frontiers Institute - NSF [DMR-1747426, DMR-1820747]
Ask authors/readers for more resources
Simulation of fermionic many-body systems on a quantum computer requires a suitable encoding of fermionic degrees of freedom into qubits. Here we revisit the superfast encoding introduced by Kitaev and one of the authors. This encoding maps a target fermionic Hamiltonian with two-body interactions on a graph of degree d to a qubit simulator Hamiltonian composed of Pauli operators of weight O(d). A system of m Fermi modes gets mapped to n = O(md) qubits. We propose generalized superfast encodings (GSEs) which require the same number of qubits as the original one but have more favorable properties. First, we describe a GSE such that the corresponding quantum code corrects any single-qubit error provided that the interaction graph has degree d >= 6. In contrast, we prove that the original superfast encoding lacks the error correction property for d <= 6. Second, we describe a GSE that reduces the Pauli weight of the simulator Hamiltonian from O(d) to O(log d). The robustness against errors and a simplified structure of the simulator Hamiltonian offered by GSEs can make simulation of fermionic systems within the reach of near-term quantum devices. As an example, we apply the new encoding to the fermionic Hubbard model on a 2D lattice.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available