quantumflow.
State
(tensor: TensorLike, qubits: Qubits = None, memory: Dict[quantumflow.cbits.Addr, Any] = None)¶The quantum state of a collection of qubits.
Note that memory usage grows exponentially with the number of qubits. (16*2^N bytes for N qubits)
asdensity
() → qf.Density¶Convert a pure state to a density matrix
expectation
(diag_hermitian: Any, trials: int = None) → BKTensor¶Return the expectation of a measurement. Since we can only measure our computer in the computational basis, we only require the diagonal of the Hermitian in that basis.
If the number of trials is specified, we sample the given number of times. Else we return the exact expectation (as if we’d performed an infinite number of trials. )
measure
() → numpy.ndarray¶Measure the state in the computational basis.
Returns:  A [2]*bits array of qubit states, either 0 or 1 

norm
() → BKTensor¶Return the state vector norm
normalize
() → qf.State¶Normalize the state
permute
(qubits: Qubits) → qf.State¶Return a copy of this state with qubit labels permuted
probabilities
() → BKTensor¶Returns:  The state probabilities 

qubit_nb
¶Return the total number of qubits
qubits
¶Return qubit labels of this state
relabel
(qubits: Qubits) → qf.State¶Return a copy of this state with new qubits
sample
(trials: int) → numpy.ndarray¶Measure the state in the computational basis the the given number of trials, and return the counts of each output configuration.
tensor
¶Returns the tensor representation of state vector
quantumflow.
zero_state
(qubits: Union[int, Qubits]) → qf.State¶Return the allzero state on N qubits
quantumflow.
w_state
(qubits: Union[int, Qubits]) → qf.State¶Return a W state on N qubits
quantumflow.
ghz_state
(qubits: Union[int, Qubits]) → qf.State¶Return a GHZ state on N qubits
quantumflow.
random_state
(qubits: Union[int, Qubits]) → qf.State¶Return a random state from the space of N qubits
quantumflow.
join_states
(*states) → qf.State¶Join two state vectors into a larger qubit state
quantumflow.
print_state
(state: qf.State, file: TextIO = None) → None¶Print a state vector
quantumflow.
print_probabilities
(state: qf.State, ndigits: int = 4, file: TextIO = None) → None¶Pretty print state probabilities.
Parameters: 

