Private States, Quantum Data Hiding, and the Swapping of Perfect Secrecy
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Private States, Quantum Data Hiding, and the Swapping of Perfect Secrecy. / Christandl, Matthias; Ferrara, Roberto.
In: Physical Review Letters, Vol. 119, No. 22, 220506, 30.11.2017.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Private States, Quantum Data Hiding, and the Swapping of Perfect Secrecy
AU - Christandl, Matthias
AU - Ferrara, Roberto
PY - 2017/11/30
Y1 - 2017/11/30
N2 - An important contribution to the understanding of quantum key distribution has been the discovery ofentangled states from which secret bits, but no maximally entangled states, can be extracted [Horodeckiet al., Phys. Rev. Lett. 94, 200501 (2005)]. The construction of those states was based on an intuition thatthe quantum mechanical phenomena of data hiding and privacy might be related. In this Letter we firmlyconnect these two phenomena and highlight three aspects of this result. First, we simplify the definition ofthe secret key rate. Second, we give a formula for the one-way distillable entanglement of certain privatestates. Third, we consider the problem of extending the distance of quantum key distribution with help ofintermediate stations, a setting called the quantum key repeater. We show that for protocols that first distillprivate states, it is essentially optimal to use the standard quantum repeater protocol based on entanglementdistillation and entanglement swapping.
AB - An important contribution to the understanding of quantum key distribution has been the discovery ofentangled states from which secret bits, but no maximally entangled states, can be extracted [Horodeckiet al., Phys. Rev. Lett. 94, 200501 (2005)]. The construction of those states was based on an intuition thatthe quantum mechanical phenomena of data hiding and privacy might be related. In this Letter we firmlyconnect these two phenomena and highlight three aspects of this result. First, we simplify the definition ofthe secret key rate. Second, we give a formula for the one-way distillable entanglement of certain privatestates. Third, we consider the problem of extending the distance of quantum key distribution with help ofintermediate stations, a setting called the quantum key repeater. We show that for protocols that first distillprivate states, it is essentially optimal to use the standard quantum repeater protocol based on entanglementdistillation and entanglement swapping.
U2 - 10.1103/PhysRevLett.119.220506
DO - 10.1103/PhysRevLett.119.220506
M3 - Journal article
C2 - 29286800
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 22
M1 - 220506
ER -
ID: 186873019