Fidelity of Wormhole Teleportation in Finite-qubit Systems

TL;DR

This paper develops a theoretical framework to analyze the fidelity of wormhole teleportation in finite-qubit systems, revealing the importance of strong coupling and system size for simulating emergent geometry and quantum gravity phenomena.

Contribution

It introduces a scramblon effective theory approach to quantify wormhole teleportation fidelity in all-to-all interacting qubit systems, highlighting the role of chaos and system size.

Findings

Strong couplings are essential for simulating semi-classical wormholes.

Teleportation fidelity diminishes with smaller system size $N$ in chaotic systems.

Large $N$ is required to observe clear signatures of emergent geometry.

Abstract

The rapid development of quantum science and technology is leading us into an era where quantum many-body systems can be comprehended through quantum simulations. Holographic duality, which states gravity and spacetime can emerge from strongly interacting systems, then offers a natural avenue for the experimental study of gravity physics without delving into experimentally infeasible high energies. A prominent example is the simulation of traversable wormholes through the wormhole teleportation protocol, attracting both theoretical and experimental attention. In this work, we develop the theoretical framework for computing the fidelity of wormhole teleportation in $N$-qubit systems with all-to-all interactions, quantified by mutual information and entanglement negativity. The main technique is the scramblon effective theory, which captures universal out-of-time-order correlations in generic chaotic systems. We clarify that strong couplings between the two systems are essential for simulating the probe limit of semi-classical traversable wormholes using strongly interacting systems with near-maximal chaos. However, the teleportation signal diminishes rapidly when reducing the system size $N$, requiring a large number of qubits to observe a sharp signature of emergent geometry by simulating the Sachdev-Ye-Kitaev model. This includes both the causal time-order of signals and the asymmetry of the teleportation signal for coupling with different signs. As a comparison, the teleportation signal increases when reducing $N$ in weakly interacting systems. We also analyze the fidelity of the generalized encoding scheme in fermionic string operators.