April 2021
Spotlight Summary by Filippo Miatto
Controllable continuous variable quantum state distributor
Quantum optical networks will soon need protocols for distributing quantum states from a source to multiple destination nodes. Unfortunately (or fortunately?), the no-cloning theorem prevents us from distributing copies of an unknown quantum state with 100% fidelity, but if we are willing to give up some fidelity we can still manage to distribute imperfect states to multiple parties.
In this work, Qingwei Wang and colleagues from Shanxi University have created a flexible scheme where not only one can choose how many copies of a state to distribute, but they can also adjust the fidelities at the receiving nodes, as long as the no-cloning theorem is satisfied. Moreover, the state in transit from the source to the distributor node is hidden behind EPR noise (as source and distributor rely on quantum teleportation by sharing an entangled resource state) and this increases the safety of the protocol.
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In this work, Qingwei Wang and colleagues from Shanxi University have created a flexible scheme where not only one can choose how many copies of a state to distribute, but they can also adjust the fidelities at the receiving nodes, as long as the no-cloning theorem is satisfied. Moreover, the state in transit from the source to the distributor node is hidden behind EPR noise (as source and distributor rely on quantum teleportation by sharing an entangled resource state) and this increases the safety of the protocol.
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Article Information
Controllable continuous variable quantum state distributor
Qingwei Wang, Yajun Wang, Xiaocong Sun, Yuhang Tian, Wei Li, Long Tian, Xudong Yu, Jing Zhang, and Yaohui Zheng
Opt. Lett. 46(8) 1844-1847 (2021) View: Abstract | HTML | PDF