Two independent groups have shown that superconducting qubits can hold a steady entangled state without ever shuttling a fragile quantum signal across a noisy channel — by deliberately leaning into the leakage that engineers usually spend everything to avoid.
Entanglement is the defining quantum correlation between distant systems, and it is the fuel of a future quantum network. Creating it between separated qubits normally requires carefully timed control pulses and the transport of a quantum state through a physical link — optical fiber, free space, or a microwave line. Every one of those links introduces noise, and quantum states cannot be copied or amplified to recover what was lost. The no-cloning theorem guarantees that a fragile entangled signal tends to dissolve before it arrives.
In two experiments reported in mid-2026, physicists flipped the usual playbook. Instead of fighting leakage, they engineered it. Each qubit is left to continuously absorb and emit photons into the surrounding electromagnetic environment — the very dissipation that normally destroys quantum information. By driving the qubits with an external light field tuned so that the incoming photons exactly balance the ones leaking out, the pair settles into a stable, non-classical equilibrium. The system finds its own steady state, and that steady state happens to be a maximally entangled one.
Entanglement without transport, in plain terms: two qubits are made to leak into a common environment while being fed by a coherent light field. The balance of inflow and outflow locks them into a shared quantum state that is stable in time, with no need to physically carry a quantum state from one qubit to the other.
Leakage is not random in this setup — it is shaped by how the qubits couple to their environment. By designing that coupling, engineers turn dissipation from a source of error into a self-correcting force. If a perturbation nudges the qubits out of the entangled state, the engineered dissipation gently pulls them back, much as friction pulls a swinging pendulum to rest. This resilience means the entanglement persists without constant, precisely timed micromanagement, and it does so at distances where sending a conventional quantum signal would be too noisy to survive.
The experiments used externally driven superconducting circuits cooled to near absolute zero, where the microwave photons that carry the qubits' information behave predictably. The broader message is a shift in thinking: entanglement does not have to be manufactured by a sequence of operations and then transported; it can be grown as a property of the system's natural equilibrium. For distributed quantum computers and a quantum internet, that lowers the bar for the links connecting distant nodes and opens a route to entanglement over distances that were previously out of reach.
Knowledge takeaway: quantum entanglement is normally created by precisely timed operations and then transported through a noisy channel; leaky-qubit schemes instead engineer controlled dissipation so the qubits settle into an entangled steady state on their own; balancing a coherent light drive against continuous photon leakage acts as a self-correcting, transport-free way to maintain entanglement; the approach, demonstrated with superconducting circuits in 2026, offers a more robust path toward distant quantum networks.