In 1923, Loupot departs for Paris and moves in with Marcelle Vittet in a hotel on Rue de Constantinople. He is thirty-one years old and has a well-established reputation in Switzerland. Those who knew him testify that he was leading a happy life at this time.

It is speculated that this move was in pursuit of employment by Devambez, whose collaborations included work with Leonetto Cappiello, one of the founding fathers of this period.