Spin Qubit is warmer than Superconducting qubits, but challenging to stabilize and scale up.
What is made of? It's made of common semiconductors, but lets examine the method.
The idea was to use the current CMOS platform to build addressable qubits. If we can build these qubits from semiconductors materials used for classical computers, we can leverage on decades of experience of know-how in the IC chip industry. Developing a stable addressable qubit on the standard CMOS platform, however, is challenging. Although, the initial prototypes have been demonstrated, it is challenging to stabilize the qubit system for scale-up.
As you see in above picture, displays the early attempts, a pair of quantum dots placed between the "source" and "sink" in a traditional CMOS setup on a silicon semiconductor substrate. Once placed on the substrate, the entire device placed in a dilution fridge to 1 K. Although, this is much warmer than the superconducting qubits, unitary operators applied using microwave pulses.
There is a lot more on this technology, that I left off on this short post. I will post more on Spin Qubits later, as I learn more.
See the Wikipedia explanation of Spin Qubits technology page for quantum computation.
See another post on Spin Qubits here
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