Kavli Affiliate: Michael McDonald
| First 5 Authors: Ben W. Reichardt, Adam Paetznick, David Aasen, Ivan Basov, Juan M. Bello-Rivas
| Summary:
Quantum computing experiments are transitioning from running on physical
qubits to using encoded, logical qubits. Fault-tolerant computation can
identify and correct errors, and has the potential to enable the dramatically
reduced logical error rates required for valuable algorithms. However, it
requires flexible control of high-fidelity operations performed on large
numbers of qubits. We demonstrate fault-tolerant quantum computation on a
quantum processor with 256 qubits, each an individual neutral Ytterbium atom.
The operations are designed so that key error sources convert to atom loss,
which can be detected by imaging. Full connectivity is enabled by atom
movement. We demonstrate the entanglement of 24 logical qubits encoded into 48
atoms, at once catching errors and correcting for, on average 1.8, lost atoms.
We also implement the Bernstein-Vazirani algorithm with up to 28 logical qubits
encoded into 112 atoms, showing better-than-physical error rates. In both
cases, "erasure conversion," changing errors into a form that can be detected
independently from qubit state, improves circuit performance. These results
begin to clear a path for achieving scientific quantum advantage with a
programmable neutral atom quantum processor.
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