Indistinguishability of photonic qubits emitted from trapped $^{40}$Ca$^+$ ions via pulsed excitation

• URL: http://arxiv.org/abs/2605.29825v1
• Date: Thu, 28 May 2026 12:06:27 GMT
• Title: Indistinguishability of photonic qubits emitted from trapped $^{40}$Ca$^+$ ions via pulsed excitation
• Abstract summary: We investigate the indistinguishability of Raman photons generated from two trapped $40$Ca$+$ ions using few-nanosecond excitation pulses.<n>We elucidate how spontaneous scattering back to the initial state affects Hong-Ou-Mandel interference.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the indistinguishability of Raman photons generated from two trapped $^{40}$Ca$^+$ ions using few-nanosecond excitation pulses. We elucidate how spontaneous scattering back to the initial state affects Hong-Ou-Mandel interference. We identify the mean number of back-decays as a measurable single-emitter quantity that correlates with achievable interference visibility of photons from two identical emitters.

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