State Generator

class perceval.utils.stategenerator.StateGenerator(encoding, polarization_base=(|{P:H}>, |{P:V}>))

StateGenerator class for conveniently generating common complex StateVectors

Parameters:

  • encoding – for specifying the output format of the StateVector supported are Encoding.RAW, Encoding.DUAL_RAIL, Encoding.POLARIZATION

  • polarization_base – (optional) you can provide your own polarization basis as a tuple of BasicStates. default=(BasicState(”|{P:H}>”), BasicState(”|{P:V}>”)

bell_state(state)

Generate a StateVector representing a Bell state

Parameters:

state (str) –

name of the bell state you want to generate:

  • ”phi+” = (|0,0>+|1,1>)/sqrt(2)

  • ”phi-” = (|0,0>-|1,1>)/sqrt(2)

  • ”psi+” = (|0,1>+|1,0>)/sqrt(2)

  • ”psi-” = (|0,1>-|1,0>)/sqrt(2)

Returns:

StateVector for a bell state

dicke_state(n, k=None)

Get the Dicke state |D(n,k)> which is the equal superposition state of all C(n,k) basis states of weight k

Mode number:

  • For RAW and Polarization: n

  • For Dual rail encoding: 2*n

Photon number:

  • For Raw encoding: k

  • For Dual rail and Polarization encoding: n

Parameters:

  • n (int) – Number of qubits equal to |1>_L or photons

  • k (Optional[int]) – Weight (Number of qubits or modes)

Return type:

StateVector

Returns:

Dicke state vector

ghz_state(n)

Generate a StateVector representing a (generalized) Greenberger-Horne-Zeilinger state

Parameters:

n (int) – order of the GHZ state

Returns:

StateVector representing the GHZ state

graph_state(graph)

Generate a StateVector representing a graph state.

Parameters:

graph (Graph) – networkx.Graph object. Edge weights are ignored.

Returns:

StateVector representing the graph state

logical_state(state)

Generate a StateVector from a list of logical state

Parameters:

state (List[int]) – list of bits

Returns:

StateVector representing the logical state