Volume 129, Number 5, March 2020
|Number of page(s)||7|
|Published online||08 April 2020|
Measurement of the concurrence of arbitrary two-photon six-qubit hyperentangled state
1 School of Science, Nanjing University of Posts and Telecommunications - Nanjing, 210003, China
2 College of Physics, Jilin University - Changchun, 130012, China
3 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications Nanjing, 210003, China
4 Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education - Nanjing, 210003, China
Received: 28 February 2020
Accepted: 25 March 2020
Hyperentanglement is the quantum system entangled in several degrees of freedom (DOFs), which has attracted extensive attention in quantum communication. In the practical application of hyperentanglement, the key step is to know the information of the hyperentanglement. In this paper, we propose an efficient protocol to measure the concurrence of arbitrary two-photon six-qubit hyperentangled state, which simultaneously entangles in the polarization and double longitudinal momentum DOFs. This protocol requires the weak cross-Kerr nonlinearity and some linear optical elements to construct the quantum nondemolition detection gate. The concurrence in each DOF can be converted into the success probability of distilling some specified states. Our protocol may play an important role in future quantum information processing.
PACS: 03.67.-a – Quantum information / 03.67.Hk – Quantum communication / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)
© EPLA, 2020
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