quantum brilliance is developing a diamond-based room-temperature quantum processor:
https://quantumbrilliance.com/press...ccelerator-in-europe-powered-by-nvidia-cuda-q
They place nitrogen (N) atoms in the diamond matrix to create electronic "holes" (one fewer electron than the carbon matrix making up the diamond). They use a scanning tunneling microscope (STM) to provide vacancies for the N atoms (which seems pretty labour-intensive).
WO2023097361A1 ATOMIC SCALE FABRICATION OF DIAMOND QUANTUM COMPUTERS 20211203
wherein removing of the passivation atoms comprises moving a tip of a scanning tunnelling microscope (STM) across the passivated surface at atomic precision and creating a pulsed voltage drop between tip and diamond surface to remove the passivation atoms; exposing the multiple de-passivated sites to a nitrogen-containing compound to adsorb nitrogen at the multiple de-passivated sites of the diamond substrate; overgrowing the multiple de-passivated sites with diamond; converting the incorporated nitrogen into multiple nitrogen vacancies; and charging the nitrogen vacancies with a negative charge.
They do have a rack-sized box for sale.
https://quantumbrilliance.com/quantum-brilliance-hardware
Haven't seen the performance figures yet.
https://quantumbrilliance.com/press...ccelerator-in-europe-powered-by-nvidia-cuda-q
They place nitrogen (N) atoms in the diamond matrix to create electronic "holes" (one fewer electron than the carbon matrix making up the diamond). They use a scanning tunneling microscope (STM) to provide vacancies for the N atoms (which seems pretty labour-intensive).
WO2023097361A1 ATOMIC SCALE FABRICATION OF DIAMOND QUANTUM COMPUTERS 20211203
wherein removing of the passivation atoms comprises moving a tip of a scanning tunnelling microscope (STM) across the passivated surface at atomic precision and creating a pulsed voltage drop between tip and diamond surface to remove the passivation atoms; exposing the multiple de-passivated sites to a nitrogen-containing compound to adsorb nitrogen at the multiple de-passivated sites of the diamond substrate; overgrowing the multiple de-passivated sites with diamond; converting the incorporated nitrogen into multiple nitrogen vacancies; and charging the nitrogen vacancies with a negative charge.
They do have a rack-sized box for sale.
https://quantumbrilliance.com/quantum-brilliance-hardware
Haven't seen the performance figures yet.