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This research introduces the PANDA algorithm, which utilizes parity measurements to engineer complex bosonic quantum states like squeezed, cat, and GKP states with high fidelity. By leveraging dispersive measurements, the protocol effectively isolates desired states within specific parity subspaces, offering a robust method for advancing quantum metrology and communication. The demonstrated noise reduction and universality of this approach represent a significant step forward in practical quantum state preparation.

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Parity measurements help build better quantum light sources

Quantum ZeitgeistAugust 23, 20265 min read

Researchers demonstrate improved preparation of quantum states—squeezed, cat, & GKP—using parity measurements and phase-space control, vital for quantum technologies.

Researchers from East China Normal University and New York University Shanghai have developed a new protocol for preparing specialized quantum states crucial for advancing quantum technologies. The work demonstrates the generation of squeezed states, achieving approximately 9 decibels of quantum noise reduction after three parity measurements, with potential for even greater noise reduction as the number of measurements increases. This technique extends beyond squeezed states to also prepare cat and Gottesman-Kitaev-Preskill states, and the authors state the scheme is universal, allowing for the preparation of an arbitrary state. Bosonic modes utilized in this…

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