c2qa.circuit.CVCircuit

class documentation

class CVCircuit(QuantumCircuit): (source)

Constructor: CVCircuit(*regs, name, probe_measure)

Extension of QisKit QuantumCircuit to add continuous variable (bosonic) gate support to simulations.

Method	`__init__`	Initialize the registers (at least one must be QumodeRegister) and set the circuit name.
Method	`add_qubit_register`	Add a qubit register to the circuit.
Method	`cv_bs`	Two-mode beam splitter gate.
Method	`cv_c_bs`	Controlled phase two-mode beam splitter
Method	`cv_c_d`	Conditional displacement gate.
Method	`cv_c_multiboson_sampling`	SNAP (Selective Number-dependent Arbitrary Phase) gates for multiboson sampling.
Method	`cv_c_pnr`	PNR (Photon number readout) TODO: Needs comments/explanation/citation!
Method	`cv_c_r`	Qubit dependent phase-space rotation gate (i.e., dispersive interaction).
Method	`cv_c_rx`	Qubit dependent phase-space rotation around sigma^x gate.
Method	`cv_c_ry`	Qubit dependent phase-space rotation around sigma^y gate.
Method	`cv_c_schwinger`	General form of a controlled 'Schwinger' gate, containing both the controlled phase beamsplitter and pairs of controlled phase space rotations as special cases.
Method	`cv_c_sq`	Conditional squeezing gate.
Method	`cv_d`	Displacement gate.
Method	`cv_delay`	CV_delay. Implements an identity gate of the specified duration. This is particularly useful for the implementation of a noise pass.
Method	`cv_ecd`	Echoed controlled displacement gate.
Method	`cv_eswap`	Exponential SWAP gate.
Method	`cv_gate_from_matrix`	Converts matrix to gate. Note that if you choose to input some complex gate that would typically be physically implemented by multiple successive gate operations, PhotonLossNoisePass, simulate(discretize=True), and animate may not be applied in a way that is physical.
Method	`cv_initialize`	Initialize qumode (or qumodes) to a particular state specified by params
Method	`cv_measure`	Measure Qumodes and Qubits in qubit_qumode_list and map onto classical bits specified in cbit_list.
Method	`cv_r`	Phase space rotation gate.
Method	`cv_snap`	SNAP (Selective Number-dependent Arbitrary Phase) gate. If no qubit is passed, then phases are applied to each qumode Fock state specified in theta and n (without explicit rotation of the qubit). If a qubit is passed, the phase will be multiplied by sigma_z-dependent geometric phase (akin to the implementation of the SNAP gate as described in Heeres et al, PRL (2015).
Method	`cv_snapshot`	Wrap the Qiskit QuantumCircuit Snapshot function, giving it a known label for later Wigner function plot generation
Method	`cv_sq`	Squeezing gate.
Method	`cv_sq2`	Two-mode squeezing gate
Method	`cv_testqubitorderf`	Undocumented
Method	`get_qmr_cutoff`	Return the qumode cutoff at the given index
Method	`get_qmr_index`	Return the qumode index for the given qubit. If not found, return -1.
Method	`get_qmr_num_qubits_per_qumode`	Return the number of qubits in the qumode register at the given index
Method	`get_qubit_index`	Return the index of the given Qubit
Method	`get_qubit_indices`	Return the indices of the given Qubits
Method	`measure_x`	Measure qubit in x using probe qubits
Method	`measure_y`	Measure qubit in y using probe qubits
Method	`measure_z`	Measure qubit in z using probe qubits
Method	`merge`	Merge in properties of QisKit QuantumCircuit into this instance.
Method	`save_circuit`	Save the simulator statevector using a qiskit class
Instance Variable	`cregs`	Undocumented
Instance Variable	`cv_snapshot_id`	Undocumented
Instance Variable	`ops`	Undocumented
Instance Variable	`probe`	Undocumented
Instance Variable	`probe_measure`	Undocumented
Instance Variable	`qmregs`	Undocumented
Instance Variable	`qregs`	Undocumented
Property	`cv_gate_labels`	All the CV gate names on the current circuit. These will be instances of ParameterizedUnitaryGate.
Property	`qumode_qubit_indices`	A qubit index list of the qubits representing the qumode registers on the circuit
Property	`qumode_qubits`	All the qubits representing the qumode registers on the circuit
Property	`qumode_qubits_indices_grouped`	Same as qumode_qubit_indices but it groups qubits representing the same qumode together. Returns a nested list.
Instance Variable	`_ancillas`	Undocumented
Instance Variable	`_calibrations`	Undocumented
Instance Variable	`_clbit_indices`	Undocumented
Instance Variable	`_clbits`	Undocumented
Instance Variable	`_data`	Undocumented
Instance Variable	`_metadata`	Undocumented
Instance Variable	`_parameter_table`	Undocumented
Instance Variable	`_qubit_indices`	Undocumented
Instance Variable	`_qubit_regs`	Undocumented
Instance Variable	`_qubits`	Undocumented

def __init__(self, *regs, name: str = None, probe_measure: bool = False): (source) ¶

Initialize the registers (at least one must be QumodeRegister) and set the circuit name.

Parameters
*regs	Undocumented
name:`str`, optional	circuit name. Defaults to None.
probe_measure:`bool`, optional	automatically support measurement with probe qubits. Defaults to False.
Raises
`ValueError`	If no QumodeRegister is provided.

def add_qubit_register(self, *regs): (source) ¶

Add a qubit register to the circuit.

Parameters
*regs:`list`	List of Registers

def cv_bs(self, theta, qumode_a, qumode_b, duration=100, unit='ns'): (source) ¶

Two-mode beam splitter gate.

Parameters
theta:`real` or `complex`	beamsplitter phase
qumode_a:`list`	list of qubits representing first qumode
qumode_b:`list`	list of qubits representing second qumode
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_c_bs(self, theta, qumode_a, qumode_b, qubit, duration=100, unit='ns'): (source) ¶

Controlled phase two-mode beam splitter

Parameters
theta:`real` or `complex`	phase
qumode_a:`list`	list of qubits representing first qumode
qumode_b:`list`	list of qubits representing second qumode
qubit	Undocumented
duration	Undocumented
unit	Undocumented
qubit_ancilla:`Qubit`	QisKit control Qubit
Returns
`Instruction`	QisKit instruction

def cv_c_d(self, theta, qumode, qubit, beta=None, duration=100, unit='ns'): (source) ¶

Conditional displacement gate.

Parameters
theta:`real`	displacement
qumode:`list`	list of qubits representing qumode
qubit:`Qubit`	control qubit
beta:`real`	By default is None, and qumode will be displaced by alpha and -alpha for qubit
duration	Undocumented
unit	Undocumented
state 0 and 1
respectively. If specified
qumode will be displaced by alpha and beta for qubit state 0 and 1.
Returns
`Instruction`	QisKit instruction

def cv_c_multiboson_sampling(self, max, qumode, qubit, duration=1, unit='us'): (source) ¶

SNAP (Selective Number-dependent Arbitrary Phase) gates for multiboson sampling.

Parameters
max:`int`	the period of the mapping
qumode:`list`	list of qubits representing qumode
qubit:`Qubit`	control qubit.
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_c_pnr(self, max, qumode, qubit, duration=100, unit='ns'): (source) ¶

PNR (Photon number readout) TODO: Needs comments/explanation/citation!

Parameters
max:`int`	the period of the mapping
qumode:`list`	list of qubits representing qumode
qubit:`Qubit`	control qubit.
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_c_r(self, theta, qumode, qubit, duration=100, unit='ns'): (source) ¶

Qubit dependent phase-space rotation gate (i.e., dispersive interaction).

Parameters
theta:`real`	phase
qumode	Undocumented
qubit	Undocumented
duration	Undocumented
unit	Undocumented
qumode_a:`list`	list of qubits representing qumode
qubit_ancilla:`qubit`	QisKit control qubit
Returns
`Instruction`	QisKit instruction

def cv_c_rx(self, theta, qumode, qubit, duration=100, unit='ns'): (source) ¶

Qubit dependent phase-space rotation around sigma^x gate.

Parameters
theta:`real`	phase
qumode	Undocumented
qubit	Undocumented
duration	Undocumented
unit	Undocumented
qumode_a:`list`	list of qubits representing qumode
qubit_ancilla:`qubit`	QisKit control qubit
Returns
`Instruction`	QisKit instruction

def cv_c_ry(self, theta, qumode, qubit, duration=100, unit='ns'): (source) ¶

Qubit dependent phase-space rotation around sigma^y gate.

Parameters
theta:`real`	phase
qumode	Undocumented
qubit	Undocumented
duration	Undocumented
unit	Undocumented
qumode_a:`list`	list of qubits representing qumode
qubit_ancilla:`qubit`	QisKit control qubit
Returns
`Instruction`	QisKit instruction

def cv_c_schwinger(self, params, qumode_a, qumode_b, qubit, duration=100, unit='ns'): (source) ¶

General form of a controlled 'Schwinger' gate, containing both the controlled phase beamsplitter and pairs of controlled phase space rotations as special cases.

It has the form exp(-i*beta*(n1_hat.sigma)(n2_hat.S)), where ni_hat = sin(theta_i)*cos(phi_i) + sin(theta_i)*sin(phi_i) + cos(theta_i). sigma = [sigmax, sigmay, sigmaz] is the vector of Pauli operators, and S = [Sx, Sy, Sz] is a vector of Schwinger boson operators,

Sx = (a*bdag + adag*b)/2 Sy = (a*bdag - adag*b)/2i Sz = (bdag*b - adag*a)/2,

obeying the commutation relations [Sj, Sk] = i*epsilon_{ijk}*Sz, where epsilon_{ijk} is the Levi-Civita tensor.

Parameters
params:`real`	[beta, theta_1, phi_1, theta_2, phi_2]
qumode_a:`list`	list of qubits representing first qumode
qumode_b:`list`	list of qubits representing second qumode
qubit	Undocumented
duration	Undocumented
unit	Undocumented
qubit_ancilla:`Qubit`	QisKit control Qubit
Returns
`Instruction`	QisKit instruction

def cv_c_sq(self, theta, qumode, qubit, duration=100, unit='ns'): (source) ¶

Conditional squeezing gate.

Parameters
theta:`real` or `complex`	squeezing ampltiude
qumode:`list`	list of qubits representing qumode
qubit:`Qubit`	control Qubit
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_d(self, alpha, qumode, duration=100, unit='ns'): (source) ¶

Displacement gate.

Parameters
alpha:`real` or `complex`	displacement
qumode:`list`	list of qubits representing qumode
duration	Undocumented
unit	Undocumented
cutoff:`int`	qumode cutoff
Returns
`Instruction`	QisKit instruction

def cv_delay(self, duration, qumode, unit='ns'): (source) ¶

CV_delay. Implements an identity gate of the specified duration. This is particularly useful for the implementation of a noise pass.

Parameters
duration:`real`	duration of delay gate
qumode:`list`	list of qubits representing qumode
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_ecd(self, theta, qumode, qubit, duration=100, unit='ns'): (source) ¶

Echoed controlled displacement gate.

Parameters
theta:`real`	displacement
qumode:`list`	list of qubits representing qumode
qubit	Undocumented
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_eswap(self, theta, qumode_a, qumode_b, duration=100, unit='ns'): (source) ¶

Exponential SWAP gate.

Parameters
theta:`real`	phase
qumode_a:`list`	list of qubits representing qumode
qumode_b:`list`	list of qubits representing qumode
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_gate_from_matrix(self, matrix, qumodes=[], qubits=[], duration=100, unit='ns', label: str = 'cv_gate_from_matrix'): (source) ¶

Converts matrix to gate. Note that if you choose to input some complex gate that would typically be physically implemented by multiple successive gate operations, PhotonLossNoisePass, simulate(discretize=True), and animate may not be applied in a way that is physical.

Parameters
matrix:np.array/nested list	Matrix for conversion into gate
qumodes:QumodeRegister/list	Qumodes initialized by QumodeRegister
qubits:QuantumRegister/list	Qubits initialized by QuantumRegister
duration	Undocumented
unit	Undocumented
label:`str`	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_initialize(self, params, qumodes): (source) ¶

Initialize qumode (or qumodes) to a particular state specified by params

Parameters
params:`list` or `int`	If an int, all specified qumodes will be initialized to the Fock state with n=params. If a list, all specified qumodes will be initialized to a superposition of Fock states, with `params[n]` the complex amplitude of Fock state `\|n>`. The length of params must be less than or equal to the cutoff.
qumodes:`list`	list of qubits representing a single qumode, or list of multiple qumodes
Raises
`ValueError`	If the Fock state is greater than the cutoff.

def cv_measure(self, qubit_qumode_list, cbit_list): (source) ¶

Measure Qumodes and Qubits in qubit_qumode_list and map onto classical bits specified in cbit_list.

Parameters
qubit_qumode_list:`List`	List of individual Qubits and Qumodes (i.e., indexed elements of QubitRegisters and QumodeRegisters)
cbit_list:`List`	List of classical bits to map measurements onto. Note: Measurement of qumodes requires log(c) classical bits, where c is the cutoff. If len(cbit_list) is greater than the required number of classical bits, excess will be ignored. If len(cbit_list) is insufficient, an error will be thrown.
Returns
`Instruction`	QisKit measure instruction

def cv_r(self, theta, qumode, duration=100, unit='ns'): (source) ¶

Phase space rotation gate.

Parameters
theta:`real`	rotation
qumode:`list`	list of qubits representing qumode
duration	Undocumented
unit	Undocumented
cutoff:`int`	qumode cutoff
Returns
`Instruction`	QisKit instruction

def cv_snap(self, theta, n, qumode, qubit=None, duration=100, unit='ns'): (source) ¶

SNAP (Selective Number-dependent Arbitrary Phase) gate. If no qubit is passed, then phases are applied to each qumode Fock state specified in theta and n (without explicit rotation of the qubit). If a qubit is passed, the phase will be multiplied by sigma_z-dependent geometric phase (akin to the implementation of the SNAP gate as described in Heeres et al, PRL (2015).

Parameters
theta:`real` or `list[real]`	phase
n:`integer` or `list[integer]`	Fock state in which the mode should acquire the phase
qumode:`list`	list of qubits representing qumode
qubit:`Qubit`	control qubit. If no qubit is passed, the gate will implement for sigma^z = +1.
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_snapshot(self): (source) ¶

Wrap the Qiskit QuantumCircuit Snapshot function, giving it a known label for later Wigner function plot generation

def cv_sq(self, theta, qumode, duration=100, unit='ns'): (source) ¶

Squeezing gate.

Parameters
theta:`real` or `complex`	squeeze
qumode:`list`	list of qubits representing qumode
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_sq2(self, theta, qumode_a, qumode_b, duration=100, unit='ns'): (source) ¶

Two-mode squeezing gate

Parameters
theta:`real` or `complex`	squeeze
qumode_a:`list`	list of qubits representing first qumode
qumode_b:`list`	list of qubits representing second qumode
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit instruction

def cv_testqubitorderf(self, phi, qubit_1, qubit_2, duration=100, unit='ns'): (source) ¶

Undocumented

def get_qmr_cutoff(self, qmr_index: int): (source) ¶

Return the qumode cutoff at the given index

def get_qmr_index(self, qubit): (source) ¶

Return the qumode index for the given qubit. If not found, return -1.

def get_qmr_num_qubits_per_qumode(self, qmr_index: int): (source) ¶

Return the number of qubits in the qumode register at the given index

def get_qubit_index(self, qubit): (source) ¶

Return the index of the given Qubit

def get_qubit_indices(self, qubits: list): (source) ¶

Return the indices of the given Qubits

def measure_x(self, qubit, cbit): (source) ¶

Measure qubit in x using probe qubits

Parameters
qubit:`Qubit`	QisKit qubit to measure
cbit:`ClassicalBit`	QisKit classical bit to measure into
Returns
`Instruction`	QisKit measure instruction

def measure_y(self, qubit, cbit): (source) ¶

Measure qubit in y using probe qubits

Parameters
qubit:`Qubit`	QisKit qubit to measure
cbit:`ClassicalBit`	QisKit classical bit to measure into
Returns
`Instruction`	QisKit measure instruction

def measure_z(self, qubit, cbit, duration=100, unit='ns'): (source) ¶

Measure qubit in z using probe qubits

Parameters
qubit:`Qubit`	QisKit qubit to measure
cbit:`ClassicalBit`	QisKit classical bit to measure into
duration	Undocumented
unit	Undocumented
Returns
`Instruction`	QisKit measure instruction