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Showing 2019 · quant-phShow all
3 papers · 2 filters
quant-ph2019★ 4 cited
Polygamy of multi-party -expected quantum entanglement
Jeong San Kim
We characterize the polygamy nature of quantum entanglement in multi-party systems in terms of -expectation value for the full range of . By investigating some properti…
quant-ph2019★ 9 cited
Upper bounds on the quantum capacity for general attenuator and amplifier
Youngrong Lim, Soojoon Lee, Jaewan Kim +1
There have been several upper bounds on the quantum capacity of the single-mode Gaussian channels with thermal noise, such as thermal attenuator and amplifier. We consider a class…
quant-ph2019★ 16 cited
Activation and superactivation of single-mode Gaussian quantum channels
Youngrong Lim, Ryuji Takagi, Gerardo Adesso +1
Activation of quantum capacity is a surprising phenomenon according to which the quantum capacity of a certain channel may increase by combining it with another channel with zero q…