1. A quantum program concealment device comprising: input means for inputting a quantum program that includes a quantum gate array indicating a unitary transformation; expansion means for generating an expanded quantum program that includes the quantum program inputted by the input means and has a quantum secret key quantum bit space that is a quantum bit space corresponding to a quantum secret key in addition to an input quantum bit space of the quantum program; control operation addition means for rewriting the expanded quantum program, which has been generated by the expansion means, so as to perform a control operation that executes a quantum program contained in the expanded quantum program in a case where the quantum secret key quantum bit space is in a predetermined state; encryption means for adding, to the expanded quantum program that is rewritten by the control operation addition means, a first quantum gate array for performing operations with respect to a state of the quantum secret key quantum bit space before the control operation is performed and a second quantum gate array for performing operations with respect to a state of the quantum secret key quantum bit space after the control operation has been performed; secret key generation means for generating a quantum secret key by performing an inverse operation of the first quantum gate array added by the encryption means, with respect to the predetermined state of the quantum secret key quantum bit space; obfuscation means for performing, on the basis of a rule that has been stored in advance, at least one of shuffling of quantum gate arrays and addition of a quantum gate array on the expanded quantum program to which the first quantum gate array has been added by the encryption means; and output means for outputting the expanded quantum program subjected to processing by the obfuscation means and the quantum secret key generated by the secret key generation means.