qml.devices.default_gaussian.photon_number

photon_number(cov, mu, params, hbar=2.0)

Calculates the mean photon number for a given one-mode state.

Parameters

• cov (array) – \(2\times 2\) covariance matrix

• mu (array) – length-2 vector of means

• params (None) – no parameters are used for this expectation value

• hbar (float) – (default 2) the value of \(\hbar\) in the commutation relation \([\x,\p]=i\hbar\)

Returns

contains the photon number expectation and variance

Return type

tuple

code/api/pennylane.devices.default_gaussian.photon_number

 

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