Quantum information capsule and information delocalization by entanglement in multiple-qubit systems

Publication date: Available online 21 January 2019Source: Physics Letters AAuthor(s): Koji Yamaguchi, Naoki Watamura, Masahiro HottaAbstractWhere do entangled multiple-qubit systems store information? For information injected into a qubit, this question is nontrivial and interesting since the entanglement delocalizes the information. So far, a common picture is that of a qubit and its purification partner sharing the information quantum mechanically. Here, we introduce a new picture of a single qubit in the correlation space, referred to as quantum information capsule (QIC), confining the information perfectly. This picture is applicable for the entangled multiple-qubit system in an arbitrary state. Unlike the partner picture, in the QIC picture, by swapping the single-body state, leaving other subsystems untouched, the whole information can be retrieved out of the system. After the swapping process, no information remains in the system.

Source: Physics Letters A - January 22, 2019 Category: Physics Source Type: research