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Researchers show that in a one-dimensional qubit chain, breaking mirror symmetry is a necessary condition for universal control using only global fields and uniform interactions. They also demonstrate an effective three-atom ZXZ interaction on a Rydberg-atom array, outside the usual blockade regime. For quantum simulation readers, this is a useful step toward more controllable analog hardware, though the work is still at the proof-of-concept stage and the scalability claims are unverified.
MIT-Harvard team finds a way to control qubits with global fields
A new theory identifies what globally driven quantum systems need to become fully controllable, addressing whether a device controlled globally can perform a full range of quantum operations. Researchers prove that for a one-dimensional chain of qubits, breaking mirror symmetry—where atoms on opposite sides are indistinguishable—enables universal quantum control with uniform interactions and global rotations.
Researchers at MIT and Harvard have demonstrated a method for controlling qubits using global fields, achieving a three-atom interaction, specifically an effective ZXZ interaction, that extends beyond the typical two-atom limitations of Rydberg-atom arrays. The…
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