Related papers: Mitigation of birefringence in cavity-based quantum networks using frequency-encoded photons

Mitigation of birefringence in cavity-based quantum networks using frequency-encoded photons

URL: http://arxiv.org/abs/2503.05014v1
Date: Thu, 06 Mar 2025 22:30:51 GMT
Title: Mitigation of birefringence in cavity-based quantum networks using frequency-encoded photons
Authors: Chengxi Zhang, Justin Phillips, Inder Monga, Erhan Saglamyurek, Qiming Wu, Hartmut Haeffner,
Abstract summary: Atom-cavity systems offer unique advantages for building large-scale distributed quantum computers.<n>In prevalent schemes where the photonic state is encoded in polarization, cavity birefringence introduces an energy splitting of the cavity eigenmodes.<n>We propose a scheme that encodes the photonic qubit in the frequency degree-of-freedom.
Score: 0.21990652930491858
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Atom-cavity systems offer unique advantages for building large-scale distributed quantum computers by providing strong atom-photon coupling while allowing for high-fidelity local operations of atomic qubits. However, in prevalent schemes where the photonic state is encoded in polarization, cavity birefringence introduces an energy splitting of the cavity eigenmodes and alters the polarization states, thus limiting the fidelity of remote entanglement generation. To address this challenge, we propose a scheme that encodes the photonic qubit in the frequency degree-of-freedom. The scheme relies on resonant coupling of multiple transverse cavity modes to different atomic transitions that are well-separated in frequency. We numerically investigate the temporal properties of the photonic wavepacket, two-photon interference visibility, and atom-atom entanglement fidelity under various cavity polarization-mode splittings and find that our scheme is less affected by cavity birefringence. Finally, we propose practical implementations in two trapped ion systems, using the fine structure splitting in the metastable D state of $\mathrm{^{40}Ca^{+}}$, and the hyperfine splitting in the ground state of $\mathrm{^{225}Ra^{+}}$. Our study presents an alternative approach for cavity-based quantum networks that is less sensitive to birefringent effects, and is applicable to a variety of atomic and solid-state emitter-cavity interfaces.

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