SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum Networks I (joint session QI/Q)
Q 24.2: Talk
Wednesday, March 8, 2023, 11:30–11:45, B305
Extracting maximal entanglement from linear cluster states — •Jarn de Jong1, Frederik Hahn1, Nikolay Tcholtchev2, Manfred Hauswirth2, and Anna Pappa1,2 — 1Electrical Engineering and Computer Science Department, Technische Universitaet Berlin, 10587 Berlin, Germany — 2Fraunhofer Institute for Open Communication Systems - FOKUS, 10589 Berlin, Germany
Most quantum information processing architectures only allow for nearest-neighbour entanglement creation. In many cases, this prevents the direct generation of maximally entangled states, which are commonly used for many communication and computation tasks. Here we show how to obtain maximally entangled GHZ states between vertices initially connected by a minimum number of connections, which specifically allows them to share linear cluster states. We prove that the largest GHZ state that a linear cluster state on n qubits can be transformed into by means of local Clifford unitaries, local Pauli measurements and classical corrections, is of size ⌊ (n+3)/2 ⌋. We demonstrate exactly which qubit selection patterns are possible below this threshold and which are not, and implement the transformation on the IBMQ Montreal quantum device for linear cluster states of up to n=19 qubits.