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A team at Yale developed a system that converts microwave photons to optical photons as a proposed platform for connecting the dilution refrigerators used in many quantum computing systems. The conversion is tricky, the team explained in an announcement from Yale, because of the difference in energy levels between microwave photons and optical photons. Their system simultaneously confines the optical field and electric field together, such that the light and microwaves couple strongly.

“The information encoded in microwave circuits can then be brought into optical circuits, and you can then lift the room temperature and propagate the optical circuits in a fiber,” Yale’s Hong Tang said.

This work was published in Nature Materials.

In early April, two independent teams demonstrated collisional quantum gates based on fermionic atoms. Qubits interact via the direct overlap of their wave functions in collisional quantum gates. They are often considered a means of improving performance over Rydberg-based gates, which are more susceptible to noise.

Both teams based their work on lithium-6 in optical lattices and published in Nature. Read the paper from the team led by the Max Planck Institute for Quantum Optics. Read the paper from the team led by ETH Zurich.

Physicists at the University of California Irvine proposed a method for preserving data impacted by quantum scrambling, in which encoded information in a complex system becomes spread over many qubits and is effectively lost. By introducing the concept of Krylov winding, the team showed that a hidden phase coherence remains in the system, even as it becomes scrambled. In their model, a precisely tuned superoperator can be applied to recover information previously considered lost.

“The conclusion is that it is possible to reverse it, but it requires an extremely fine-tuned and very fine level of control on your system,” said UC Irvine’s Thomas Scaffidi.

This work was published in Physical Review Letters.

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Quantum Campus is edited by Bill Bell, a science writer and marketing consultant who has covered physics and high-performance computing for more than 25 years. Disclosure statement.