For a great deal of cases NO..!!! Defectors such as doctors, sport coaches, Athletes or anybody of 'interest' to the "revolution" will be considered traitors to the cause and not allowed to return. However, some 'celebrities' (for unjust this might be) have been allowed to return (e.g. Manolin 'El medico de la Sala', Issac Delgado y Jose Contreras), but of course no official apology or statement has been made for the treatment and harassment these people and their families suffered. On the other hand, doctors (just a regular doctor) who have defected in countries like Venezuela and Ecuador (cases I know) have to wait 5-10 years for their Cuban passports to be authorized to travel back to Cuba.