TY - JOUR
T1 - Quantum information capsule and information delocalization by entanglement in multiple-qubit systems
AU - Yamaguchi, Koji
AU - Watamura, Naoki
AU - Hotta, Masahiro
N1 - Funding Information:
The authors thank Ursula Carow-Watamura and Takeshi Tomitsuka for discussions. This research was partially supported by JSPS KAKENHI Grant Numbers JP16K05311 (M.H.) and JP18J20057 (K.Y.), and by Graduate Program on Physics for the Universe of Tohoku University (K.Y.).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/4/10
Y1 - 2019/4/10
N2 - Where 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.
AB - Where 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.
KW - Black hole information loss problem
KW - Quantum entanglement
KW - Quantum information
KW - Quantum memory
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U2 - 10.1016/j.physleta.2019.01.036
DO - 10.1016/j.physleta.2019.01.036
M3 - Article
AN - SCOPUS:85060438419
SN - 0375-9601
VL - 383
SP - 1255
EP - 1259
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 12
ER -