  Verification of quantum computation is a task to efficiently check whether an
output given from a quantum computer is correct. Existing verification
protocols conducted between a quantum computer to be verified and a verifier
necessitate quantum communication to unconditionally detect any malicious
behavior of the quantum computer solving any promise problem in ${\sf BQP}$. In
this paper, we remove the necessity of the communication of qubits by proposing
a "physically classical" verification protocol in which the verifier just sends
coherent light to the quantum computer.
