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]]>The results, published in *Nature Communications* recently published the team’s experimental results, A Squeezed Quantum Microcomb on a Chip. Yi’s photonics-based approach is promising because a field of light is also full spectrum; each light wave in the spectrum has the potential to become a quantum unit. Yi hypothesized that entangling fields of light would achieve a quantum state.

millimeter-sized structure that envelopes the photons and generates a microcobe device that efficiently converts photons from single to multiple wavelengths. Light circulates around the ring to build up optical power. This power buildup enhances chances for photons to interact, which produces quantum entanglement between fields of light in the microcomb.

Through multiplexing, Yi’s team verified the generation of 40 qumodes from a single microresonator on a chip, proving that multiplexing of quantum modes can work in integrated photonic platforms.

Yi’s multiplexing technique opens a path toward quantum computing for real-world conditions, where errors are inevitable. Yi’s photonics-based system offers two additional advantages in the quantum computing quest. Quantum computing platforms that use superconducting electronic circuits require cooling to cryogenic temperatures. Because the photon has no mass, quantum computers with photonic integrated chips can run or sleep at room temperature. Lee fabricated the microresonator on a silicon chip using standard lithography techniques, which implies the resonator or quantum source can be mass-produced.

**Original Release:** Eureka Alert

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]]>Since noise corrupts the data being processed, variational quantum algorithms provide a viable interim solution. The power of quantum computers can be tapped into for tasks that classical computers can’t do easily, then classical computers are used to compliment the computational power of quantum devices.

The algorithms are called variational since the optimization process varies the algorithm on the fly, like machine learning. It changes parameters and logic gates to minimize a cost function, which is a mathematical expression that measures how well the algorithm has performed the task. The problem is solved when the cost function reaches its lowest possible value. The quantum computer estimates the cost function, then passes that result back to the classical computer. The classical computer then adjusts the input parameters and sends them to the quantum computer, which runs the optimization again.

The article is a comprehensive introduction for researches starting in the field. The authors discuss all the applications for algorithms and how they work, the challenges, pitfalls, and how to address them. It also looks into the future, considering the best opportunities for achieving quantum advantage on the computers that will be available in the next couple of years.

**Original Release: **Eureka Alert

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]]>Superconductors conduct electricity without any resistance when cooled below a certain temperature. They manifest quantum properties on the scale of everyday objects, making them highly attractive candidates for building computers based on quantum physics to store data and perform computing operations.

However, qubits are extremely sensitive and lose their quantum properties due to electromagnetic fields, heat and collisions with air molecules. Protecting the qubits can be achieved by creating resilient qubits using topological superconductors that host protected metallic states on their boundaries or surfaces.

Topological superconductors, such as LaPt3P, recently discovered through muon spin relaxation experiments and extensive theoretical analysis, are exceptionally rare and are of tremendous value to the future industry of quantum computing.

Two sets of samples were prepared in the University of Warwick and in ETH Zurich. Muon experiments were then performed in two different types of muon facilities: in the ISIS Pulsed Neutron and Muon Source in the STFC Rutherford Appleton Laboratory and in PSI, Switzerland. The paper ‘Chiral singlet superconductivity in the weakly correlated metal LaPt3P’ is published in *Nature Communications**. *

EEDI

https://www.eurekalert.org/pub_releases/2021-06/uok-ndo061521.php

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