Detecting Temporal Correlation via Quantum Random Number Generation
All computing devices, including quantum computers, must exhibit that for a
given input, an output is produced in accordance with the program. The outputs
generated by quantum computers that fulfill these requirements are not
temporally correlated, however. In a quantum-computing device comprising
solid-state qubits such as superconducting qubits, any operation to rest the
qubits to their initial state faces a practical problem. We applied a
statistical analysis to a collection of random numbers output from a 20-qubit
superconducting-qubit cloud quantum computer using the simplest random number
generation scheme. The analysis indicates temporal correlation in the output of
some sequences obtained from the 20 qubits. This temporal correlation is not
related to the relaxation time of each qubit. We conclude that the correlation
could be a result of a systematic error.
Yutaka Shikano Kentaro Tamura Rudy Raymond