mm.physics.gaussian.loss_XYd

mrmustard.physics.gaussian.loss_XYd(transmissivity, nbar)

Returns the X, Y matrices and the d vector for the noisy loss (attenuator) channel.

\[X = math.sqrt(transmissivity) Y = (1-transmissivity) * (2 * nbar + 1) * hbar / 2\]

Reference: Alessio Serafini - Quantum Continuous Variables (5.77, p. 108)

Parameters:

• transmissivity (float) – value of the transmissivity, must be between 0 and 1

• nbar (float) – photon number expectation value in the environment (0 for pure loss channel)

Returns:

the X, Y matrices and the d vector for the noisy loss channel

Return type:

Tuple[Matrix, Matrix, None]

code/api/mrmustard.physics.gaussian.loss_XYd

 

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