Complementarity of information sent via different bases

Date: 2009-02-23
Authors Shengjun Wu (吴盛俊), Sixia Yu (郁司夏), and Klaus Mølmer
Journal No. Phys. Rev. A 79, 022320 (2009)
Abstract We discuss quantitatively the complementarity of information transmitted by a quantum system prepared in a basis state in one out of several different mutually unbiased bases (MUBs). We obtain upper bounds on the information available to a receiver who has no knowledge of which MUB was chosen by the sender. These upper bounds imply a complementarity of information encoded via different MUBs and ultimately ensure the security in quantum key distribution protocols.