tl;dr No.

ELI5: The goal in quantum computers is to get many qubits into into a superposition where they are sort of connected to each other. As the number of qubits inside a single quantum computer is increased linearly, the problem size they can solve grows exponentially. If you add a second quantum computer, you're only doubling the computational power. With seven computers you can parallelize breaking of e.g. 7 keys, but the number of qubits inside a single quantum computer determine the size of the encryption key you're able to break.

Finally, I hope I didn't ruin some horcrux reference here, with the seven and all.