> arbitrary sequence of nearest-neighbor 2-qubit gates
The classical equivalent is (very handwavily) a processor that can perform all the ops from a reasonable small ISA, but each op has 1% chance of failing silently.
Hence, any quantum algorithm can be put on this device in principle, but you are limited to stuff that uses only 50 qubits and does not mind the 1% error. There are not really any useful things you can do in the presence of (accumulating) 1% errors, beside proof of concept contrived problems.
The classical equivalent is (very handwavily) a processor that can perform all the ops from a reasonable small ISA, but each op has 1% chance of failing silently.
Hence, any quantum algorithm can be put on this device in principle, but you are limited to stuff that uses only 50 qubits and does not mind the 1% error. There are not really any useful things you can do in the presence of (accumulating) 1% errors, beside proof of concept contrived problems.