Quantum teleportation of spin coherent states

Alexey N. Pyrkov, Tim Byrnes

Quantum teleportation is the transfer of quantum information between two locations by the use of shared entanglement. Current teleportation schemes broadly fall under one of two categories, either qubit or continuous-variable teleportation. Spin coherent states on spin ensembles can be teleported under the continuous-variable approximation for states with small deviations from a given polarization. However, for spin-coherent states with large deviations, no convenient teleportation protocol exists. Recently, we introduced a teleportation scheme where a spin-coherent state lying on the equator of the Bloch sphere is teleported between distant parties [A. N. Pyrkov and T. Byrnes, New J. Phys. 16, 073038 (2014)]. Here we generalize the protocol to a spin-coherent state with an arbitrary position on the Bloch sphere. Our proposed scheme breaks classical bounds based on communication in the unconditional case and quantum state estimation with postselection.

Dik Bouwmeester, Jian-Wei Pan, Harald Weinfurter +1 more

Alexey N Pyrkov, Tim Byrnes

We introduce a quantum teleportation scheme that transfers a spin coherent state between two locations using entanglement. In the scheme an unknown spin coherent state lying on the equator of the Bloch sphere, such as realized in a coherent two-component Bose–Einstein condensate, is teleported onto a distant spin coherent state using only elementary operations and measurements. The scheme works in the regime beyond the standard continuous variables approximation based on the Holstein–Primakoff transformation. We analyze the error of the protocol with the number of particles N in the spin coherent state under decoherence and find that it scales favorably with N . The simplicity of the operations involved and the robustness under decoherence should make the protocol suitable under realistic experimental conditions.

Xiong, Wen-Yuan, Wang +1 more

Dirk Bouwmeester, Klaus Mattle, Jian-Wei Pan +3 more

Meryem El Kirdi, Abdallah Slaoui, Hanane El Hadfi +1 more