However, in the original proposal of quantum teleportation, the input unknown state to be teleported should be encoded with single photon. If we adopt the single photon as input source, limited by the rather low frequency conversion efficiency, we need to wait a much longer time for teleportation to occur. In this regard, it is expected that, with the future advances in structured light nonlinear frequency conversion, our scheme can work in the single-photon scenario and will pave the way for realizing truly secure high-dimensional quantum teleportation in the upcoming quantum network. Here, by leveraging the spatial-mode-engineered frequency conversion, we realize the remote transport of high-dimensional orbital angular momentum (OAM) states at a distance without direct transmission of information carriers.
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Furthermore, by exploring the full transverse entanglement, we construct another strategy of quantum imaging with interaction-free light. It is expected that, with the future advances in nonlinear frequency conversion, our scheme will pave the way for realizing truly secure high-dimensional quantum teleportation in the upcoming quantum network. Here, we use a strong coherent light instead of single photon as the input state to enhance the SFG conversion (~4%) to perform the HDBLSM, and thus realizing the remote transport of high-dimensional OAM states from a coherent beam to a single photon. Therein the knowledge of the coherent source is not used in our scheme, which is similar with one of the key features of teleportation.
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In summary, we have demonstrated a remote transport of high-dimensional OAM superposition states at a distance, by adopting the perfect vortices as the OAM basis for both a successful preparation of high-dimensional maximal entanglement and a better performance of SFG-based HDBLSM. We have experimentally achieved the average transport fidelity of \(0.879\pm 0.048\) and \(0.796\pm 0.066\) for a complete set of 3-dimensional and 5-dimensional MUB, respectively. Further, by exploring the full transverse spatial-mode entanglement, we have succeeded in realizing the ghost imaging of amplitude objects with interaction-free light, which is fundamentally different from previous quantum imaging techniques49, such as the conventional ghost imaging44 or quantum imaging with undetected photons50. By calculating the CNR of recorded images, we estimate that the imaging performance of this protocol can reach the same level with the traditional ghost imaging. It can be expected that, with the development of the state-of-the-art nonlinear frequency conversion technology, our scheme can be competent to work fully with all single photons in the near future, that is truly high-dimensional quantum teleportation.
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Specifically, by exploiting perfect vortices, we prepare high-dimensional yet maximally entangled orbital angular momentum (OAM) states as communication channel. Then, we employ sum-frequency generation (SFG) with a strong coherent state, which is used to bear the high-dimensional OAM state, to enhance the frequency conversion, and thus performing the perfect-vortex-based high-dimensional Bell-like state measurement reliably. Figure 1 illustrate our experimental setup for remote transport of high-dimensional OAM states and the quantum imaging with interaction-free light. The 710 nm laser beam is directed to the Lithium triborate crystal (LBO), via second-harmonic generation, to generate the ultraviolet pulses centered at 355 nm.
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The efficient transport and engineering of photonic orbital angular momentum (OAM) lie at the heart of various related classical and quantum applications. Here, by leveraging the spatial-mode-engineered frequency conversion, we realize the remote transport of high-dimensional orbital angular momentum (OAM) states between two distant parties without direct transmission of information carriers. We exploit perfect vortices for preparing high-dimensional yet maximal O AM entanglement. Based on nonlinear sum-frequency generation working with a strong coherent wave packet and a single photon, we conduct the Bell-like state measurements for high-dimensional perfect vortices. We experimentally achieve an average transport fidelity 0.879 ± 0.048 and 0.796 ± 0.066 for a complete set of 3-dimensional and 5-dimensional OAM mutually unbiased bases, respectively.