Solid State Color Centers

 


Researchers have been working on a new device that will change the world of complex, quantum computers and networks. They are looking to advance the scalability of solid state color centers. Solid-state color centers are photon spin interfaces. They are also good candidates for qubit nodes. These are important units for processing and storing quantum information. 

Solid state color centers can absorb  light at specific wavelengths. 

To be useful in the real world, they must work in a fast and controllable manner. The center should also allow the fine-tuning of their optical, transition frequencies, and spin manipulation. The new device offers all these functions and allows for the system to be scalable. 

At the frontiers in optics and laser science (FiOLS), D. Andrew Golter spoke at the Colorado convention in Denver.

“ Future large scale, quantum technologies will require building blocks that include all necessary functionality, while also holding the potential for massive scalability. We believe our work is an important step towards engineering these building blocks.”  

Researchers at MIT, MITRE, Sandia National Laboratories and the University of Arizona designed a new device. It is an integrated system on chip device that contains vacancy color centers. Their optical output is coupled to the diamond nanowave guides on the chip. 

The qubit’s  spin transitions can be tuned and changed through microwave lines. These can change the qubit’s quantum states and even strain actuating cantilevers. This can be used to change the electronic and optical properties of its spin centers.

A multi-channel photonic integrated circuit supplies independent optical excitation for multiple qubits at the same time. 

The research shows that each output channel of the circuit achieves high extinction and high speed optical switching. There is notably little cross talk between channels. The new device can be used for high fidelity strain and microwave control over multiple qubit nodes. 

Golter summarizes, “We are working now to integrate these color center qubit control devices together with on-chip photonics, with the goal of achieving a truly scalable platform for quantum information processing.” 


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