Anomalous lack of decoherence of the macroscopic quantum superpositions based on phase-covariant quantum cloning.
We show that all macroscopic quantum superpositions (MQS) based on phase-covariant quantum cloning are characterized by an anomalous high resilence to the decoherence processes. The analysis supports the results of recent MQS experiments and leads to conceive a useful conjecture regarding the realization of complex decoherence-free structures for quantum information, such as the quantum computer.
Dipartimento di Fisica dell'Universitá La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma 00185, Italy.
Francesco
F
De Martini
Fabio
F
Sciarrino
Nicolò
N
Spagnolo