Quantum entanglement long remained a curiosity — 'spooky action at a distance,' as Erwin Schrödinger put it, which shatters our conventional picture of the world. But in 2008, physicists realized: entanglement can be used not only to transfer bits, but also to teleport energy. Early experiments were limited to two particles: the common GHZ state collapses upon measurement. The breakthrough came with the W state — an equal superposition of all arrangements with exactly one excited qubit. It's like a shared wallet that several heirs can draw from at once, without breaking their connection.

Entangled qubits in the W state form a single energy pool. When Alice performs a quantum measurement, she drops a portion of energy E₀ into the common pot. Then she sends a classical bit, and the others take turns drawing their shares. The order is strict: the first in line withdraws the largest sum, each subsequent one less. The total balance is uncompromising: the sum of extracted shares never exceeds the input. Energy is not created anew, but redistributed within the entangled ensemble, obeying the speed of light — the classical signal must arrive.

An experiment on a real quantum processor, the IBM Lagos, confirmed the theory. For three qubits with 0.707 arbitrary units injected, the first receiver got 0.526 (74%), the second 0.170 (24%) — totaling about 98% of the original energy. For four and five qubits, the pattern held, small losses attributed to unavoidable decoherence. Additional tests showed symmetry: the order of polling the receivers does not change the final figures. Thus quantum information becomes an operational resource — almost a currency that knows how to make its own change.

Another facet intrigues: perhaps energy is simply frozen information, and this experiment allows us to directly observe their mutual conversion for the first time.

Looking ahead, the scheme promises an 'energy internet' — quantum networks where nodes share energy wirelessly, regulating the thermal budget of future processors. Scaling to tens of qubits, hybrid photon-superconducting architectures, probing topological phases — these are the first sketches. The fundamental question of exactly how state reduction redistributes energy in a multipartite system remains open. But now it is backed by experiment: the quantum wallet works, and we are just beginning to read its ledgers.