Enabling Deterministic Passive Quantum State Transfer with Giant Atoms

• URL: http://arxiv.org/abs/2605.12018v1
• Date: Tue, 12 May 2026 12:06:28 GMT
• Title: Enabling Deterministic Passive Quantum State Transfer with Giant Atoms
• Abstract summary: Achieving quantum state transfer in passive ways can become a powerful asset for scalable quantum networks.<n>We show that giant atoms coupled to 1D waveguides provide a platform for such a passive, deterministic transfer.<n>Our results establish giant atoms as a powerful platform for realizing high-fidelity quantum state transfer in a setting without time-dependent control.
• Score: 30.634025315483466
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Achieving quantum state transfer in passive ways can become a powerful asset for scalable quantum networks. Here, we demonstrate how giant atoms coupled to 1D waveguides provide a platform for such a passive, deterministic transfer. Engineering the position and strength of coupling points, we show that the nonlocal interaction can be utilized for the emission of time-reversal-symmetric single-photon wavepackets by spontaneous decay. We first derive general analytical conditions under which arbitrary qubit decays can be mapped to wavevector-dependent couplings that guarantee perfect state transfer in the continuum limit of infinitely many coupling points. Then, for experimentally relevant configurations with a finite number of coupling points, we demonstrate that high transfer fidelities can still be achieved by optimization, reaching 87% with only two coupling points and exceeding 99% with ten or more. We further analyze the robustness of the protocol against disorder in leg positioning and extend the formalism to environments with nonlinear dispersion, showing that dispersion-induced distortions can be fully compensated by judiciously chosen setups. Our results establish giant atoms as a powerful platform for realizing high-fidelity quantum state transfer in a setting without time-dependent control, opening new avenues for scalable quantum networks and engineered light-matter interfaces.

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