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MIT researchers have significantly extended coherence times in spin ensembles by sevenfold using an optimized Carr-Purcell-Meiboom-Gill pulse sequence. This breakthrough reframes inherent material imperfections as resources rather than obstacles, reducing experimental scaling costs and enhancing robustness against parameter variations for scalable quantum systems. The advancement directly addresses critical control challenges necessary for practical solid-state quantum technologies.

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Phys: MIT Engineers Boost Coherence Times by 7× in Spin Ensembles

Quantum ZeitgeistJune 17, 20265 min read

MIT engineers advanced quantum control, boosting coherence times by 7x in spin ensembles.

Massachusetts Institute of Technology researchers have simplified the creation of entangled spin states, reducing the experimental resources needed from a scaling factor of O(Nq) to a fixed cost, independent of the number of qubits, Nq, within ensembles ranging from approximately 10 to 100 emitters. The team, based in the Department of Electrical Engineering and Computer Science and the Research Laboratory of Electronics, achieved this by reframing the challenges posed by inherent variations in solid-state defects, leveraging those differences as a resource rather than an obstacle. Specifically, an optimized pulse sequence, a Carr-Purcell-Meiboom-Gill (CPMG) based protocol, enhances ensemble-average coherence times by more than…

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