Debasmita Banerjee
Debasmita Banerjee
20 Feb 2016

Berry Phase Based Quantum System To Produce Noise Free Operations

Scientists from the University of Chicago’s Institute for Molecular Engineering and the University of Konstanz have jointly unveiled a noise resilient quantum logic operation on the base of a berry phase geometrical structure. Unlike the concept of classical bits, quantum bits or qubits exhibit simultaneous vector states between a null and full value. To have a full working stage, the qubits are controlled using fine-tunes or noise-isolated procedures.

The quantum systems lack a mechanism to avoid the interference of noise with their orientation. In comparison to electronic devices, they are fragile to noise and external stimuli. The newest project by the team has resulted in a noise resilient quntum bit circuit which is also immune to foreign factors. Scientists understood that when an electron follows a circular pathway, it retains the memory of the path it traversed. This geometric phase, named after S. Pancharatnam and Sir Michael Berry is commonly known as Berry phase.

Electronic spin within an atomic-scale defect in diamond
In this research, scientists manipulated the berry phase of a quantum state within a nitrogen-vacancy center, an atomic-scale point defect in diamond. To witness the berry phase, the team fabricated loops similar to a tangerine slice inside the quantum space of all potential pairs of quantum states. This approach extensively improves applications based on this theory including photonic networks.

One of the important features that makes it useful as a quantum information carrier is the noise resilence property. To test the feature, researchers added noise to the laser source. Significantly, the output was same as that of the output where the input source has no additional noise in it.

Guido Burkard, a professor of physics at the University of Konstanz and theory collaborator on the project explained that the Berry phase Loop device could produce a fault-tolerant and robust quantum information processing system. According to him, although the collaborative project is at its infancy, the underlying mathematics is very rich and encouraging. The research was published in the Nature Photonics journal.

Source: University of Chicago

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