Harvard's Quantum Leap: Molecules as Qubits for Breakthrough Computing
January 22, 2025
In a remarkable demonstration, the team achieved a two-qubit Bell state with 94% accuracy by manipulating the rotational alignment of the trapped molecules.
The study also details the creation of an iSWAP gate, a quantum logic circuit essential for generating entanglement, which enhances quantum computing capabilities.
Harvard scientists have achieved a significant breakthrough in quantum computing by successfully trapping molecules and performing quantum operations.
The findings, published in the journal Nature, focus on using ultra-cold polar sodium-cesium (NaCs) molecules as qubits, which are crucial for quantum information processing.
This accomplishment is the result of 20 years of dedicated research in the field, as emphasized by senior co-author Kang-Kuen Ni.
The research team cooled NaCs molecules to near absolute zero and utilized optical tweezers to securely trap them, allowing for precise control over their interactions.
The team also assessed errors from any remaining motion during operations and proposed improvements for future experiments to enhance stability and accuracy.
Kang-Kuen Ni highlighted that molecules offer unique internal structure properties, presenting new opportunities for advancing quantum technologies.
This breakthrough paves the way for the development of molecular quantum computers, leveraging the complex structures of molecules for enhanced computational power.
Funding for this groundbreaking study was provided by organizations such as the Air Force of Scientific Research and the National Science Foundation.
The research team included members from Ni's lab and physicists from the University of Colorado, showcasing collaboration in advancing quantum technology.
Quantum computing promises speeds exponentially faster than classical computers by harnessing quantum mechanics, with potential applications across various fields including medicine and finance.
Summary based on 3 sources
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Sources

Harvard Gazette • Jan 21, 2025
Researchers make leap in quantum computing
AZoQuantum • Jan 22, 2025
Harnessing Molecular Complexity for Quantum Computing