Researchers at Harvard and MIT demonstrated error-corrected quantum computing using 48 logical qubits on a 280-qubit processor, a major milestone toward practical quantum computers that could revolutionize drug discovery and materials science.
A team of researchers from Harvard University and the Massachusetts Institute of Technology has achieved a landmark breakthrough in quantum computing by demonstrating the first large-scale error-corrected quantum computations. Published in Nature, the work used a 280-physical-qubit neutral-atom quantum processor to create 48 logical qubits — units of quantum information protected against the random errors that have long plagued the field.
Quantum computers promise to solve problems that are fundamentally impossible for classical computers, from simulating molecular interactions for drug discovery to optimizing complex logistics systems. However, quantum bits (qubits) are extremely fragile, and errors accumulate rapidly during computation. Error correction — encoding information redundantly across multiple physical qubits to create reliable logical qubits — has been the holy grail of quantum computing for decades.
“Published in Nature, the work used a 280-physical-qubit neutral-atom quantum processor to create 48 logical qubits — units of quantum information protected against the random errors that have long plagued the field.”
The Harvard-MIT team, led by physicist Mikhail Lukin, used an innovative approach based on arrays of individual atoms trapped by laser beams. By physically rearranging the atoms during computation, they could dynamically form the connections needed for error correction codes. This allowed them to run quantum algorithms on logical qubits with significantly lower error rates than on raw physical qubits.
The experiment demonstrated several quantum algorithms running on up to 48 logical qubits simultaneously, including complex entanglement operations that would be impossible on error-prone physical qubits. The results showed that adding more redundancy consistently improved computational accuracy — a critical validation of the theoretical framework underlying quantum error correction.
Industry leaders and academic experts described the achievement as a turning point. The work was performed on hardware developed by QuEra Computing, a Boston-based startup co-founded by Lukin, signaling that practical, fault-tolerant quantum computing may arrive sooner than many had predicted.
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