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The Deterministic MPDC Source essentially runs multiple probabilistic SPDC photon sources in parallel (multiplexing) to create a deterministic output. The system pulses all photon sources simultaneously to probabilistically generate entangled pairs. When a desired four-photon emission occurs at one of the banked sources, two of these photons are directed into a polarization analyzer equipped with photon detectors. If the heralding signal successfully confirms multiple photons, the analyzer verifies that the correct two-photon N00N state has been created on the heralded pair state pathway. If fewer than two photons are detected, the system discards the emissions, effectively filtering out vacuum noise and unwanted multipair states. This automated filtering prevents noise from falsely triggering adjacent nodes in a communication chain. The successful heralding signal then triggers a controller connected to an optical switch yard. When a correct signal is detected, the switch yard turns "on" the corresponding source's pathway, routing the heralded pair into a single output mode for network injection. Delay lines are seamlessly incorporated into each source's pathway to allow the optical switches enough time to act. Ultimately, this architecture achieves a highly deterministic operating regime with an estimated 86% probability that at least one source generates a valid herald event during each pulse. The Deterministic MPDC source is available for patent licensing.