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Comparison of Three Quantum Computers

This table compares the network-type quantum computer under development at ImPACT with the gate-type and annealing-type quantum computers
The main features of our machine are that all 2,000 implemented bits operate effectively with the same characteristics and that all of those 2,000 bits are interconnected by 4,000,000 synapses. As a result, a problem size under 2,000 can be implemented as some sort of combinatorial optimization problem.
The competing D-Wave 2,000-bit machine, though having the same number of bits, operates effectively at only 98% of those bits, and since it only has a very sparse connectivity of 6,000 connections, it is currently limited to a solvable problem size of 50 to 60.
The gate-type and annealing-type quantum computers use a superconducting quantum circuit that operates in the microwave region, so those types need to be run at an ultra-low temperature of 10 mK. Our equipment, however, uses an optical parametric oscillator network that operates in the optical region, which means it can be run at room temperature.