Narrowband four-photon states from spontaneous four-wave mixing

• URL: http://arxiv.org/abs/2601.05558v1
• Date: Fri, 09 Jan 2026 06:16:56 GMT
• Title: Narrowband four-photon states from spontaneous four-wave mixing
• Authors: Yifan Li, Justin Yu Xiang Peh, Chang Hoong Chow, Boon Long Ng, Vindhiya Prakash, Christian Kurtsiefer,
• Abstract summary: We generate correlated four-photon states by direct continuous-wave pumping at nominal powers.<n>We infer a time-correlated four-photon generation rate of 2.5(4)x106 counts per second close to saturation.<n>The photons produced are near-resonant with atomic transitions, and have a bandwidth in the order of MHz, making them readily compatible with quantum networking applications involving atoms.
• Score: 2.9628968506657625
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We observe time-correlated four photons within a correlation window of 20ns from spontaneous four-wave mixing via a double-Lambda scheme in a cold cloud of Rb-87 atoms. In contrast to high-power pulsed pumping of chi^(2) nonlinear processes in crystals, our scheme generates correlated four-photon states by direct continuous-wave pumping at nominal powers. We verify the presence of genuinely correlated four-photon states over accidentals by higher-order intensity cross-correlation measurements and accidental subtraction. We infer a time-correlated four-photon generation rate of 2.5(4)x10^6 counts per second close to saturation. The photons produced are near-resonant with atomic transitions, and have a bandwidth in the order of MHz, making them readily compatible with quantum networking applications involving atoms.

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