qrisp.qf_inversion#

qf_inversion(qf, prec=None)[source]#

Calculates the multiplicative inverse of a QuantumFloat.

Parameters:

qfQuantumFloat: The QuantumFloat to invert.
precint, optional: The precision of the inversion. If the precision is set to $k$ , the approximated inverse $q_{a p r}$ and the true inverse $q_{t r u e}$ satisfy $| q_{r e s} - q_{t r u e} | < 2^{- k}$ . By default, a suited precision will be determined from the other input.

Returns:

resultQuantumFloat: A QuantumFloat containing the inverse.

Examples

We calculate the inverse of 0.75

>>> from qrisp import QuantumFloat, qf_inversion
>>> qf = QuantumFloat(2, -2)
>>> qf[:] = 0.75
>>> qf_inv = qf_inversion(qf, prec = 4)
>>> print(qf_inv)
{1.3125: 1.0}
>>> 0.75**-1
1.3333333333333333