Fast Quantum Links: Delivered Before They Melt ⚡ экспресс
Scientists have figured out how to transfer quantum entanglement faster between many points using a quantum switch. It's like a chef who doesn't wait for all the ingredients to be ready, but starts cooking each one right away. This approach reduces noise buildup and could make the quantum internet more reliable. Can we weave a worldwide web without getting entangled?
Quantum entanglement between distant points degrades over time — noise increases entropy, much like heat melts ice cream. Traditional methods wait for all pairs to appear before assembling a multipartite state. But delay spoils quality.
A new protocol acts without waiting: each Bell pair, delivered by photons at speed of light, is used immediately. Its mathematical trick is a “vertex cover” in the connection graph. This is a minimal set of nodes that holds the whole network together, like a few dominoes in a chain. Only this core is stored, while other connections are updated on the fly. The idea relies on stabilizers — recipes for quantum states developed by Daniel Gottesman.
The result: in simulations of up to 50 qubits, the error drops by 45%. The protocol confidently reaches the threshold fidelity of ½ even when noise is strong. From this threshold onward, multipartite entanglement becomes practically useful. The quality of the final “assembly” is assessed by photometry — like a dosimeter for melted ice cream.
🎯 Today’s record entangled ensemble is 20 qubits. The new method targets 50+, reducing melting and bringing the quantum internet closer.