Abstract
A bidirectional quantum controlled teleportation scheme using a seven-qubit maximally entangled state as quantum channel is proposed. This means that Alice can transmit an arbitrary single qubit state of qubit a to Bob and Bob can transmit an arbitrary single qubit state of qubit b to Alice via the control of the supervisor Charlie.

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Acknowledgements
This work is supported by Shaanxi Natural Science Foundation under Contract No.2013JM1009 and the Innovation Fund of graduate school of Xi’an University of Posts and Telecommunications under Contract No.ZL 2013-33.
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Duan, YJ., Zha, XW., Sun, XM. et al. Bidirectional Quantum Controlled Teleportation via a Maximally Seven-qubit Entangled State. Int J Theor Phys 53, 2697–2707 (2014). https://doi.org/10.1007/s10773-014-2065-1
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DOI: https://doi.org/10.1007/s10773-014-2065-1