Quantum Campus shares the latest in quantum science and technology. Read by more than 1,400 researchers, we publish on Fridays and are always looking for news from across the country. Want to see your work featured? Submit your ideas to the editor.

Sensing protocol

A team of physicists and electrical engineers at the University of Southern California published a new coherence-stabilized sensing protocol, demonstrating it on a superconducting qubit. The protocol improves the sensitivity of qubit frequency measurement by 165 percent when compared to Ramsey interferometry. It uses a continuous drive to stabilize a component of the Bloch vector to amplify the “faint whisper[s]” detected by quantum sensors.

“Our study gives the best sensitivity for detecting a qubit’s frequency to date. Most importantly, our protocol requires no feedback and no extra control or measurement resources, making it immediately applicable across various quantum computing and quantum sensor technologies,” USC’s Eli Levenson-Falk, who led the study, said in an announcement.

This work appeared in Nature Communications.

Airy beams

In another quantum sensing advancement, a team designed a custom diffraction grating array capable of generating Airy beams. These beams of neutrons travel in a parabola and can “self-heal,” regenerating their original shape after being disrupted by an obstacle and making them a particularly promising tool in materials science and imaging.

The international group was led by the University at Buffalo, the University of Waterloo, and NIST.

This study was published in Physical Review Letters.

Improved non-linear coupling

MIT researchers demonstrated what they believe is “the strongest nonlinear light-matter coupling ever achieved in a quantum system,” according to a university announcement. Their novel superconducting circuit architecture showed coupling about an order of magnitude stronger than prior demonstrations. It could significantly improve the measurements and error corrections needed to increase the accuracy and reliability of quantum computers.

This work appeared in Nature Communications.

Shallow shadows

A UCSD-based team proposed the concept of “robust shallow shadows” to mitigate noise during post-processing quantum measurements. Using Bayesian inference, the method showed advantages over “single-qubit measurements for predicting diverse state properties, such as fidelity and entanglement entropy,” the team said.

This work was published in Nature Communications.

Quickbits

• Entanglement of photonic modes from a continuously driven two-level system (npj Quantum Information)

• IonQ and Chattanooga-based communications company EPB ink $22 million deal to establish the EPB Quantum Center

• IBM unveils $150 billion investment in US-based tech manufacturing and quantum computing (UPI)

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