Delft University of Technology researchers have successfully teleported quantum information across a basic network. This is the first of its type, and a big step towards the quantum Internet.

Figure 1: Networks three node connectivity.

Figure 1 shows that This accomplishment was made feasible by significantly increased quantum memory and improved quantum link quality between the network's three nodes. The ability to transport quantum information between network nodes is what gives a future quantum Internet its power. [1]

Small quantum processors make up the nodes of such a network. It's not straightforward to send quantum information across these processors. One option to do so is to communicate quantum bits using light particles. But due to the unavoidable losses in glass fiber cables, the light particles are unlikely to arrive.

Teleportation is a more efficient approach to transport quantum data. The quantum teleportation protocol gets its name from its resemblance to teleportation in sci-fi movies: the quantum bit vanishes on the sender's side and reappears on the receiver's side. [2]

A report states that there are three steps to teleportation:

First, the teleporter must create an entangled state between Alice and Charlie. Though Alice and Charlie are not physically connected, they are both linked to Bob. Alice and Bob accomplish this by tying their processors together.

After that, Bob and Charlie become intertwined. Bob then transmits the entanglement on as it was by performing a particular measurement in its processor. The teleporter is now ready to be deployed, and Alice and Charlie have become entangled.

The second phase,the ‘message’ — the quantum bit — to be transported is created. This quantum data is prepared by Charlie.

The third step,the actual teleportation from Charlie to Alice. For this, Charlie uses its quantum processor and half of its entangled state to perform a joint measurement with the message. As a result of this measurement, the information on Charlie’s side vanishes and reappears on Alice’s side instantly.

In fact, the quantum bit was encrypted during transmission, with Charlie’s measurement result determining the key.

As a result, Charlie sends the measurement result to Alice, which then performs the appropriate quantum operation to decode the quantum bit. The quantum information is ready for use after Alice has completed the proper operation. [3]

References:

1. https://newslogic.in/science/quantum-internet-breakthrough-data-sent-between-two-network-nodes-that-arent-connected/
2. https://gadgets360.com/science/news/researchers-develop-quantum-network-transmit-quantum-information-transfer-data-nodes-not-connected-3010487
3. https://technoblender.com/quantum-internet-breakthrough-data-sent-between-two-network-nodes-that-arent-connected/

Cite this article:

Sri Vasagi K (2022), Researchers Teleported Quantum Information Through a Basic Network, Anatechmaz, pp. 327