Timelike Quantum Energy Teleportation

We establish a novel quantum protocol called Timelike Quantum Energy Teleportation (TQET) between two separated parties $A$ and $B$, designed for transporting quantum energy across spacetime. The amount of energy gained through TQET is always greater than or equal to that obtained via natural time evolution for any spin chain where $A$ and $B$ are distinguishable. This protocol uses temporal and spatial quantum correlations between agents separated by space and time. The energy supplier injects energy into the system by measuring the ground state of a many-body system that evolves over time, while the distant recipient performs a conditional operation using feedback from the supplier. When Bob acts immediately after receiving Alice’s outcome, the protocol reduces to conventional QET. We present a proof-of-concept demonstration in the Ising model using quantum simulations. TQET increases energy efficiency from approximately 3% to around 40%, representing over a 13-fold improvement compared to QET. Furthermore, we analyzed the relationship between entanglement in time and TQET, validating the role of temporal correlations in energy activation between agents across spacetime.

💡 Research Summary

The manuscript introduces Timelike Quantum Energy Teleportation (TQET), a dynamical extension of the conventional Quantum Energy Teleportation (QET) protocol. In standard QET, an energy supplier (Alice) performs a local projective measurement on the ground state of a many‑body system, thereby injecting energy, and immediately communicates the classical outcome to a distant receiver (Bob). Bob then applies a conditional local unitary that extracts energy from his subsystem. Because Bob acts instantly, the protocol ignores the natural unitary evolution of the post‑measurement state.

TQET relaxes this instantaneous requirement. After Alice’s measurement at time t = 0, the system evolves under a local Hamiltonian H for a controllable delay t > 0. Bob receives Alice’s classical bit b and, at time t, applies a conditional unitary U_B(b)=exp