Scientists improved quantum teleportation by reducing noise interference with a new method involving hybrid entanglement and achieved nearly 90% accuracy in teleporting quantum states; This could greatly improve secure quantum communications.

A research team led by Academician Guangkan Guo from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), in collaboration with a research team at the University of Turku, Finland, has managed to overcome environmental noise. High-precision quantum teleportation using omnidirectional hybrid entanglement. Their findings were recently published in the journal Science Developments.

Overcoming quantum teleportation problems

Quantum teleportation is an important protocol in quantum communication that allows unknown quantum states to be transmitted remotely using quantum entanglement. However, due to the fragile nature of quantum entanglement, quantum teleportation is very sensitive to noise. Achieving high-quality quantum teleportation in noisy environments has been a pressing issue.

Improvements in quantum noise control

Previously, to solve the decoherence problem of open quantum systems in a noisy environment, the research team developed a comprehensive method to control the polarization and frequency of photons using a complex optical path design and programmable spatial light modulators. This approach allowed them to create a fully controllable quantum simulator of phase decoherence and achieve quantum teleportation that overcomes noise by exploiting non-local memory effects.

New methods of quantum teleportation

However, non-local memory effects require hard quantum resources that are not usually available, such as entanglement of the medium. Based on these results, the current work presents a versatile quantum teleportation technique that effectively reduces environmental noise.

Using a fully controlled quantum phase decoherence simulator, the researchers applied specific phase modulations to the environment to prepare a dual-photon polarization frequency hybrid entangled initial state. These photons were then distributed to two separate user terminals, where each underwent decoherence evolution.

Conclusion and implications

Ultimately, using classical communication, the researchers performed appropriate unitary operations on the resulting quantum bits to recover the transmitted quantum state, achieving a measurement accuracy approaching 90%. Polarization states never violated Bell’s inequality; This was indicative of quantum teleportation based on hidden quantum nonlocality.

This method offers a new way to overcome ambient noise, unlike traditional methods such as dynamic decomposition and decoherent subspaces, and improves the understanding of quantum nonlocality.