I was wondering why till date Grover search has been implemented only till 3 qubits (corresponding to size of database = 8). Refer this paper
The reason why I ask is that we have much larger sized quantum computers today. For eg IBM has 50 qubits, Google has announced 72. Why can't we run a larger sized Grover algorithm on these computers ? Some of my guesses (based on theoretical issues) are as follows :
Circuit architecture restrictions : Perhaps the gate set and the underlying architecture of the circuits provided by these computers puts a restriction.
Error corrections : Additional qubits are required for correcting errors.
I would like to know if there are any additional practical/physics issues that is limiting the use of Grover search currently.