qml.devices.default_gaussian.poly_quad_expectations

poly_quad_expectations(cov, mu, wires, device_wires, params, hbar=2.0)

Calculates the expectation and variance for an arbitrary polynomial of quadrature operators.

Parameters

• cov (array) – covariance matrix

• mu (array) – vector of means

• wires (Wires) – wires to calculate the expectation for

• device_wires (Wires) – corresponding wires on the device

• params (array) – a \((2N+1)\times (2N+1)\) array containing the linear and quadratic coefficients of the quadrature operators \((\I, \x_0, \p_0, \x_1, \p_1,\dots)\)

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

Returns

the mean and variance of the quadrature-polynomial observable

Return type

tuple

code/api/pennylane.devices.default_gaussian.poly_quad_expectations

 

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