bsm_wrapper module

class bsm_wrapper.BSMWrapper(name, p_dark, det_eff, visibility)[source]

Bases: Node

A wrapper for a Bell-State Measurement (BSM) detector component.

This component wraps a BSMDetector and provides a simplified external interface for connecting quantum input ports and a single classical output port. It also ensures that a request UUID is tracked between inbound and outbound messages.

The wrapper receives qubits on qin0 and qin1, forwards them to the internal BSM detector, and outputs classical measurement results via cout. A request_uuid header is extracted from inbound messages and reinserted into outbound classical messages to preserve request–response correlation.

It uses the bsm_logger logger object, retrieved with: logging.getLogger("bsm_logger").

Parameters:

  • name (str) – Name of the BSM wrapper node.

  • p_dark (float) – Dark-count probability per detector, i.e., the probability of a detector click when no photon was present.

  • det_eff (float) – Detector efficiency, i.e., the probability of detecting an incoming photon.

  • visibility (float) – HOM visibility parameter of the BSM detector (photon indistinguishability), should be between 0 and 1.

Examples

>>> bsm_wrap = BSMWrapper(
...     name="BSM_1",
...     p_dark=0.001,
...     det_eff=0.95,
...     visibility=0.9,
... )
>>> bsm_wrap.ports["qin0"].tx_input(qubit_msg_0)
>>> bsm_wrap.ports["qin1"].tx_input(qubit_msg_1)