qrisp.QuantumArray.encode#

QuantumArray.encode(encoding_array)[source]#

The encode method allows to quickly bring a QuantumArray in a desired computational basis state. For this, it performs a circuit, bringing fresh qubits into the integer state specified by the encoder.

A shorthand for this method is given by the [:] operator.

Note that the qubits to initialize have to be fresh (i.e. no operations performed on them).

Parameters:

value: A value supported by the encoder.

Examples

We create a QuantumArray and encode the identity matrix.

>>> from qrisp import QuantumArray, QuantumFloat
>>> qtype = QuantumFloat(5)
>>> q_array = QuantumArray(qtype, (4,4))
>>> q_array.encode(np.eye(4))
>>> print(q_array)
{OutcomeArray([[1, 0, 0, 0],
               [0, 1, 0, 0],
               [0, 0, 1, 0],
               [0, 0, 0, 1]]): 1.0}

Using the slice operator we can also encode on slices of QuantumArrays

>>> q_array = QuantumArray(qtype, (4,4))
>>> q_array[:,:2] = np.ones((4,2))
>>> print(q_array)
{OutcomeArray([[1, 1, 0, 0],
               [1, 1, 0, 0],
               [1, 1, 0, 0],
               [1, 1, 0, 0]]): 1.0}