What is the highest qubit rate today's quantum computer can operate at? Can the latest quantum computer match the FLOP speed of Exa scale computing or 10^18 FLOPS switching rate? The answer is no. What is the problem that researchers failed to figure out the performance of quantum computers matching Exa scale computing? Qubit processing algorithms with quantum entanglement and information processing by deep and neural networks and other complex modifications for qubit retention and reliability are handled properly already but the LNA that has been designed so far by advanced microwave technology, is in the vicinity of GHz (10^9 Hz) in literature survey which is highly lagging more innovation to match the qubit switching rate at ultra wide band .

Since quantum computers operate at cryogenic temperature or 4.2 K, noise floor amplitude for ultra wide band, can still overreach the qubit fidelity and amplitude for quantum computer designed at this temperature. The only way the designed highly expensive quantum computer can reliably function when at least some 10 times Peta Hz (10^15 Hz) LNA has been designed by novel microwave processing and design technology.

This is a fabrication and design challenge for LNA at 10^15 Hz or higher to Exa Hz (10^18 Hz) that if not designed concurrently in the hardware core of the quantum computer when its qubit information processing software part is designed, quantum computers will be very expensive, may have high yield but will be very slow compared to Exa scale computing.

So, Microwave design professionals soon have to figure out the fabrication and integration of Peta (10^15) to Exa (10^18) Hz LNA if quantum computers can really be high computing Exa scale supercomputers. Please focus on this issue as without this LNA at the wide band range mentioned, no other innovations will work.

Sincerely,

Dr. Nabil Shovon Ashraf

Currently unaffiliated as a faculty with any university in Dhaka, Bangladesh since May 2022

Dhaka, Bangladesh.