# Why do the IBM and Google processors both have 53 qubits?

As I understand from this IBM post both the IBM and Google teams have independently built 53-qubit processors. What is the significance of the number 53? It is purely coincidental, or is there a deeper reason why both team have the same number of qubits?

• Google intended to make $54$ qubits but one was not working. – Mark S Oct 23 at 16:59
• And Google probably chose 54 so they would be superior to IBM's 53-qubit device. – Peter Shor Nov 7 at 11:57

• Is IBM's architecture known/released? Sycamore is $9\times 6=54$ arranged in a nearest-neighbor matrix, with $1$ qubit not working. $53$ is prime, so maybe IBM too has a similar grid with some qubits not working - either that, or some other architecture that enables the non-prime qubit count topology. – Mark S Nov 5 at 18:28