麻豆淫院

Quantum teleportation is a fascinating process that involves transferring a particle's quantum state to another distant location, without moving or detecting the particle itself. This process could be central to the realization of a so-called "quantum internet," a version of the internet that enables the safe and instant transmission of quantum information between devices within the same network.

Quantum teleportation is far from a recent idea, as it was experimentally realized several times in the past. Nonetheless, most previous demonstrations utilized frequency conversion rather than natively operating in the telecom band.

Researchers at Nanjing University recently demonstrated the teleportation of a telecom-wavelength photonic qubit (i.e., a quantum bit encoded in light at the same wavelengths supporting current communications) to a telecom quantum memory. Their paper, published in , could open new possibilities for the realization of scalable quantum networks and thus potentially a quantum internet.

"Quantum teleportation is always a fascinating protocol in quantum communication for its ability to transfer quantum states without ever revealing," Xiao-Song Ma, senior author of the paper, told 麻豆淫院. "To extend the state transmission distance further, the incorporation of quantum memory into a quantum teleportation system is of critical importance."

The main objective of the recent study by Ma and his colleagues was to successfully integrate a telecom solid-state quantum memory into a quantum teleportation system, which would enable the storage of transmitted quantum information. The main role of this memory would be to spread and store entangled particles across a quantum network (i.e., entanglement distribution).

Quantum networks rely on quantum repeaters, devices that can break the distances across which information is transmitted into shorter and more manageable sections, known as elementary links. When placed at the end of these sections, quantum memories could store quantum information for the time necessary for entanglement to be established across entire segments of networks, which could in turn enable its transmission across longer distances.

"We employed five systems to accomplish the experiment," explained Ma. "These include an Input state preparation; an EPR-source to generate entangled photon pairs from an integrated photonic chip, a Bell-state measurement and a quantum memory based on erbium ion ensembles. We also employed a frequency distribution and fine-tuning module based on an F-P cavity and PDH technique."

This recent work by Ma and his colleagues shows that quantum information could be transferred across a network using devices and optical wavelengths that are compatible with those currently employed in communications. The team's demonstration of quantum teleportation could inform the advancement of quantum networks, potentially contributing to the future realization of a reliable quantum internet.

"Our study demonstrated the quantum teleportation from telecom photons to a solid-state quantum memory based on erbium ions for the first time," added Ma. "Our entire system uses components compatible with existing fiber networks perfectly. This telecom-compatible platform for generating, storing and processing quantum states of light establishes a highly promising approach to large-scale quantum networks."

As part of their next studies, the researchers plan to focus on improving the performance of the erbium ion-based solid-state memory employed in their experiments. More specifically, they would like to extend its storage times and improve the efficiency with which it stores quantum information.

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