It is impossible to run a simulation of 50-qubit system using even the best classical computers. Using my Laptop i7 Intel high-speed modern laptop, even 25 qubit simulation is not practical.
A 100-qubit system (and high fidelity) will be fascinating and may even open the doors to the quantum advantage era. I am not sure how they will build a simulator for it and that is another post. As of today, two companies claim to use Atoms for qubits, and both promise perfect 100 qubits platforms that do not use massive dilution refrigeration systems.
One is the coldquanta, and I did a post on their technology, and you can see it here. I will delve into coldquanta technology again, providing some interesting details I recently learned.
Another 100 qubit project is Atom Computing (different team, different company,) building quantum computers using nuclear spin qubits formed from arrays of optically-trapped neutral atoms, a bit different approach than the coldquanta. They cool, trap, and control qubits wirelessly using lasers. The first generation computer named Phoenix (the other one is Hilbert, as Hilbert space in Physics) claims to harness the power of 100 qubits to explore innovative quantum algorithm development.
So, Phoenix employs the nuclear spin of neutral atoms to construct qubits. According to Atom computing, the benefits of neutral atom quantum computers include:
"Massive scalability: Neutral atom qubits lack electrical charge and can be tightly packed into an array, held only microns apart with focused laser light. The atomic array expanded to thousands or millions of qubits without substantially changing the system's overall footprint.
Fidelity: Neutral atoms are intrinsically identical, have been extensively characterized, and present no fundamental physics obstacles to achieving sufficiently high fidelity to enable fault tolerance at scale.
Reduced complexity: All of the control functions of neutral atom qubits are mediated by light propagating through free space rather than individual electrical cables attached to each qubit.
Long coherence: The closed outer electron shell of alkaline-earth metal atoms provides insensitivity to environmental perturbations, enabling our qubits to achieve >40 second coherence times."
These statements are published on their website here.
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