A deterministic and efficient source of frequency-polarization hyper-encoded photonic qubits

• URL: http://arxiv.org/abs/2410.03454v1
• Date: Fri, 4 Oct 2024 14:13:31 GMT
• Title: A deterministic and efficient source of frequency-polarization hyper-encoded photonic qubits
• Authors: N. Coste, D. A. Fioretto, S. E. Thomas, S. C. Wein, H. Ollivier, I. Maillette de Buy Wenniger, A. Henry, N. Belabas, A. Harouri, A. Lemaitre, I. Sagnes, N. Somaschi, O. Krebs, L. Lanco, P. Senellart,
• Abstract summary: We demonstrate the generation of photonic qubits hyper-encoded in frequency and polarization based on a semiconductor quantum dot in a cavity. Our approach brings the advantages of quantum dot sources to the field of quantum information processing based on frequency encoding.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The frequency or color of photons is an attractive degree of freedom to encode and distribute the quantum information over long distances. However, the generation of frequency-encoded photonic qubits has so far relied on probabilistic non-linear single-photon sources and inefficient gates. Here, we demonstrate the deterministic generation of photonic qubits hyper-encoded in frequency and polarization based on a semiconductor quantum dot in a cavity. We exploit the double dipole structure of a neutral exciton and demonstrate the generation of any quantum superposition in amplitude and phase, controlled by the polarization of the pump laser pulse. The source generates frequency-polarization single-photon qubits at a rate of 4 MHz corresponding to a generation probability at the first lens of 28 $\pm$ 2%, with a photon number purity > 98%. The photons show an indistinguishability > 91% for each dipole and 88% for a balanced quantum superposition of both. The density matrix of the hyper-encoded photonic state is measured by time-resolved polarization tomography, evidencing a fidelity to the target state of 94 $\pm$ 8% and concurrence of 77 $\pm$ 2%, here limited by frequency overlap in our device. Our approach brings the advantages of quantum dot sources to the field of quantum information processing based on frequency encoding.

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