Quantum entanglement, a phenomenon where different parts of a system display correlations that cannot be explained using non-quantum means, has long been a challenge for quantum technology. The inevitable leakage of energy and information from a quantum system into its surrounding environment, known as dissipation, has been a major obstacle. However, a recent collaboration between physicists at the University of Illinois Urbana-Champaign and the University of Chicago has demonstrated a way to exploit dissipation to generate entanglement, a 'resource' that quantum technologies use to perform tasks inaccessible to standard, classical technologies.
The researchers developed a new technique called synthetic squeezing to realize the phenomenon in a laboratory setting with a pair of superconducting qubits. This technique allows for the generation of entanglement in a steady state, meaning that, in principle, it can be maintained indefinitely over arbitrarily large distances. The researchers believe that this technique holds promise as a more robust and reliable alternative to current methods of entanglement generation.
One of the key insights of this research is that it runs counter to our experience with quantum entanglement. Rather than preparing it at one instant and watching it decay, it emerges as the natural point of relaxation in this system. This is almost like having a 'refrigerator' that pumps out external influences to maintain entanglement instead of pumping out heat to maintain coldness.
This research has important implications for the future of quantum technology. By bypassing the transport stage, which is vulnerable to environmental noise, it opens up new possibilities for remote entanglement without the need to directly transmit quantum information through noisy, lossy channels. This could lead to the development of more robust and reliable quantum networks, which are essential for the realization of quantum technology's true potential.
However, there are still challenges to be overcome. The quality of the entanglement generated through synthetic squeezing is generally lower than other methods due to noise and hardware imperfections. The researchers are now working to extend the process to multi-qubit systems and explore entanglement distillation, a protocol that could allow for the combination of qubits with low entanglement to create a few with a very high degree of entanglement. This could enable the performance of actual quantum computing operations with this system.
In conclusion, this research represents a significant step forward in the field of quantum technology. By exploiting dissipation to generate entanglement, it opens up new possibilities for remote entanglement and more robust quantum networks. While there are still challenges to be overcome, the potential for the development of practical quantum technology is exciting and could have a profound impact on our understanding of the universe.
