def construct_circuit(self, x, qr=None, inverse=False): """ Construct the second order expansion based on given data. Args: x (Union(numpy.ndarray, list[Parameter], ParameterVector)): 1-D to-be-transformed data. qr (QuantumRegister, optional): the QuantumRegister object for the circuit, if None, generate new registers with name q. inverse (bool, optional): whether or not inverse the circuit Returns: QuantumCircuit: a quantum circuit transform data x. Raises: TypeError: invalid input ValueError: invalid input """ if len(x) != self._num_qubits: raise ValueError( "number of qubits and data dimension must be the same.") if qr is None: qr = QuantumRegister(self._num_qubits, name='q') qc = QuantumCircuit(qr) for _ in range(self._depth): for i in range(self._num_qubits): qc.u2(0, pi, qr[i]) for pauli in self._pauli_strings: coeff = self._data_map_func( self._extract_data_for_rotation(pauli, x)) p = Pauli.from_label(pauli) inst = evolution_instruction([[1, p]], coeff, 1) qc.append(inst, qr) return qc
def construct_circuit(self, x, qr=None): """ Construct the second order expansion based on given data. Args: x (numpy.ndarray): 1-D to-be-transformed data. qr (QauntumRegister, optional): the QuantumRegister object for the circuit, if None, generate new registers with name q. inverse (bool, optional): whether or not inverse the circuit Returns: QuantumCircuit: a quantum circuit transform data x. """ if not isinstance(x, np.ndarray): raise TypeError("x must be numpy array.") if x.ndim != 1: raise ValueError("x must be 1-D array.") if x.shape[0] != self._num_qubits: raise ValueError("number of qubits and data dimension must be the same.") if qr is None: qr = QuantumRegister(self._num_qubits, name='q') qc = QuantumCircuit(qr) for _ in range(self._depth): for i in range(self._num_qubits): qc.u2(0, pi, qr[i]) for pauli in self._pauli_strings: coeff = self._data_map_func(self._extract_data_for_rotation(pauli, x)) p = Pauli.from_label(pauli) inst = evolution_instruction([[coeff, p]], 1, 1) qc.append(inst, qr) qc = qc.decompose() return qc
def construct_circuit(self, k: Optional[int] = None, omega: float = 0, measurement: bool = False) -> QuantumCircuit: """Construct the kth iteration Quantum Phase Estimation circuit. For details of parameters, please see Fig. 2 in https://arxiv.org/pdf/quant-ph/0610214.pdf. Args: k: the iteration idx. omega: the feedback angle. measurement: Boolean flag to indicate if measurement should be included in the circuit. Returns: QuantumCircuit: the quantum circuit per iteration """ if self._operator is None or self._state_in is None: return None k = self._num_iterations if k is None else k a = QuantumRegister(1, name='a') q = QuantumRegister(self._operator.num_qubits, name='q') self._ancillary_register = a self._state_register = q qc = QuantumCircuit(q) if isinstance(self._state_in, QuantumCircuit): qc.append(self._state_in, q) else: qc += self._state_in.construct_circuit('circuit', q) # hadamard on a[0] qc.add_register(a) qc.h(a[0]) # controlled-U qc_evolutions_inst = evolution_instruction( self._slice_pauli_list, -2 * np.pi, self._num_time_slices, controlled=True, power=2**(k - 1), shallow_slicing=self._shallow_circuit_concat) if self._shallow_circuit_concat: qc_evolutions = QuantumCircuit(q, a) qc_evolutions.append(qc_evolutions_inst, list(q) + [a[0]]) qc.data += qc_evolutions.data else: qc.append(qc_evolutions_inst, list(q) + [a[0]]) # global phase due to identity pauli qc.p(2 * np.pi * self._ancilla_phase_coef * (2**(k - 1)), a[0]) # rz on a[0] qc.p(omega, a[0]) # hadamard on a[0] qc.h(a[0]) if measurement: c = ClassicalRegister(1, name='c') qc.add_register(c) # qc.barrier(self._ancillary_register) qc.measure(self._ancillary_register, c) return qc
def construct_circuit( self, state_register=None, ancillary_register=None, auxiliary_register=None, measurement=False, ): """Construct the Phase Estimation circuit Args: state_register (QuantumRegister): the optional register to use for the quantum state ancillary_register (QuantumRegister): the optional register to use for the ancillary measurement qubits auxiliary_register (QuantumRegister): an optional auxiliary quantum register measurement (bool): Boolean flag to indicate if measurement should be included in the circuit. Returns: QuantumCircuit: the QuantumCircuit object for the constructed circuit Raises: RuntimeError: Multiple identity pauli terms are present ValueError: invalid mode """ # pylint: disable=invalid-name if self._circuit is None: if ancillary_register is None: a = QuantumRegister(self._num_ancillae, name='a') else: a = ancillary_register self._ancillary_register = a if state_register is None: if self._operator is not None: q = QuantumRegister(self._operator.num_qubits, name='q') elif self._unitary_circuit_factory is not None: q = QuantumRegister( self._unitary_circuit_factory.num_target_qubits, name='q') else: raise RuntimeError('Missing operator specification.') else: q = state_register self._state_register = q qc = QuantumCircuit(a, q) if auxiliary_register is None: num_aux_qubits, aux = 0, None if self._state_in_circuit_factory is not None: num_aux_qubits = self._state_in_circuit_factory.required_ancillas( ) if self._unitary_circuit_factory is not None: num_aux_qubits = \ max(num_aux_qubits, self._unitary_circuit_factory.required_ancillas_controlled()) if num_aux_qubits > 0: aux = QuantumRegister(num_aux_qubits, name='aux') qc.add_register(aux) else: aux = auxiliary_register qc.add_register(aux) # initialize state_in if self._state_in is not None: qc.data += self._state_in.construct_circuit('circuit', q).data elif self._state_in_circuit_factory is not None: self._state_in_circuit_factory.build(qc, q, aux) # Put all ancillae in uniform superposition qc.u2(0, np.pi, a) # phase kickbacks via dynamics if self._operator is not None: # check for identify paulis to get its coef for applying # global phase shift on ancillae later num_identities = 0 for p in self._pauli_list: if np.all(np.logical_not(p[1].z)) and np.all( np.logical_not(p[1].x)): num_identities += 1 if num_identities > 1: raise RuntimeError( 'Multiple identity pauli terms are present.') self._ancilla_phase_coef = p[0].real if isinstance( p[0], complex) else p[0] if len(self._pauli_list) == 1: slice_pauli_list = self._pauli_list else: if self._expansion_mode == 'trotter': slice_pauli_list = self._pauli_list elif self._expansion_mode == 'suzuki': slice_pauli_list = suzuki_expansion_slice_pauli_list( self._pauli_list, 1, self._expansion_order) else: raise ValueError( 'Unrecognized expansion mode {}.'.format( self._expansion_mode)) for i in range(self._num_ancillae): qc_evolutions_inst = evolution_instruction( slice_pauli_list, -self._evo_time, self._num_time_slices, controlled=True, power=(2**i), shallow_slicing=self._shallow_circuit_concat) if self._shallow_circuit_concat: qc_evolutions = QuantumCircuit(q, a) qc_evolutions.append(qc_evolutions_inst, qargs=list(q) + [a[i]]) qc.data += qc_evolutions.data else: qc.append(qc_evolutions_inst, qargs=list(q) + [a[i]]) # global phase shift for the ancilla due to the identity pauli term qc.u1(self._evo_time * self._ancilla_phase_coef * (2**i), a[i]) elif self._unitary_circuit_factory is not None: for i in range(self._num_ancillae): self._unitary_circuit_factory.build_controlled_power( qc, q, a[i], 2**i, aux) # inverse qft on ancillae if self._iqft.num_qubits != len( a): # check if QFT has the right size try: # try resizing self._iqft.num_qubits = len(a) except AttributeError: raise ValueError( 'The IQFT cannot be resized and does not have the ' 'required size of {}'.format(len(a))) if hasattr(self._iqft, 'do_swaps'): self._iqft.do_swaps = False qc.append(self._iqft.to_instruction(), a) if measurement: c_ancilla = ClassicalRegister(self._num_ancillae, name='ca') qc.add_register(c_ancilla) # real hardware can currently not handle operations after measurements, which might # happen if the circuit gets transpiled, hence we're adding a safeguard-barrier qc.barrier() qc.measure(a, c_ancilla) self._circuit = qc return self._circuit
def construct_circuit( self, state_register=None, ancillary_register=None, auxiliary_register=None, measurement=False, ): """ Construct the Phase Estimation circuit Args: state_register (QuantumRegister): the optional register to use for the quantum state ancillary_register (QuantumRegister): the optional register to use for the ancillary measurement qubits auxiliary_register (QuantumRegister): an optional auxiliary quantum register measurement (bool): Boolean flag to indicate if measurement should be included in the circuit. Returns: the QuantumCircuit object for the constructed circuit """ if self._circuit is None: if ancillary_register is None: a = QuantumRegister(self._num_ancillae, name='a') else: a = ancillary_register self._ancillary_register = a if state_register is None: if self._operator is not None: q = QuantumRegister(self._operator.num_qubits, name='q') elif self._unitary_circuit_factory is not None: q = QuantumRegister( self._unitary_circuit_factory.num_target_qubits, name='q') else: raise RuntimeError('Missing operator specification.') else: q = state_register self._state_register = q qc = QuantumCircuit(a, q) if auxiliary_register is None: num_aux_qubits, aux = 0, None if self._state_in_circuit_factory is not None: num_aux_qubits = self._state_in_circuit_factory.required_ancillas( ) if self._unitary_circuit_factory is not None: num_aux_qubits = max( num_aux_qubits, self._unitary_circuit_factory. required_ancillas_controlled()) if num_aux_qubits > 0: aux = QuantumRegister(num_aux_qubits, name='aux') qc.add_register(aux) else: aux = auxiliary_register qc.add_register(aux) # initialize state_in if self._state_in is not None: qc.data += self._state_in.construct_circuit('circuit', q).data elif self._state_in_circuit_factory is not None: self._state_in_circuit_factory.build(qc, q, aux) # Put all ancillae in uniform superposition qc.u2(0, np.pi, a) # phase kickbacks via dynamics if self._operator is not None: # check for identify paulis to get its coef for applying global phase shift on ancillae later num_identities = 0 for p in self._pauli_list: if np.all(np.logical_not(p[1].z)) and np.all( np.logical_not(p[1].x)): num_identities += 1 if num_identities > 1: raise RuntimeError( 'Multiple identity pauli terms are present.') self._ancilla_phase_coef = p[0].real if isinstance( p[0], complex) else p[0] if len(self._pauli_list) == 1: slice_pauli_list = self._pauli_list else: if self._expansion_mode == 'trotter': slice_pauli_list = self._pauli_list elif self._expansion_mode == 'suzuki': slice_pauli_list = suzuki_expansion_slice_pauli_list( self._pauli_list, 1, self._expansion_order) else: raise ValueError( 'Unrecognized expansion mode {}.'.format( self._expansion_mode)) for i in range(self._num_ancillae): qc_evolutions_inst = evolution_instruction( slice_pauli_list, -self._evo_time, self._num_time_slices, controlled=True, power=(2**i), shallow_slicing=self._shallow_circuit_concat) if self._shallow_circuit_concat: qc_evolutions = QuantumCircuit(q, a) qc_evolutions.append(qc_evolutions_inst, qargs=[x for x in q] + [a[i]]) qc.data += qc_evolutions.data else: qc.append(qc_evolutions_inst, qargs=[x for x in q] + [a[i]]) # global phase shift for the ancilla due to the identity pauli term qc.u1(self._evo_time * self._ancilla_phase_coef * (2**i), a[i]) elif self._unitary_circuit_factory is not None: for i in range(self._num_ancillae): self._unitary_circuit_factory.build_controlled_power( qc, q, a[i], 2**i, aux) # inverse qft on ancillae self._iqft.construct_circuit(mode='circuit', qubits=a, circuit=qc, do_swaps=False) if measurement: c_ancilla = ClassicalRegister(self._num_ancillae, name='ca') qc.add_register(c_ancilla) # qc.barrier(a) qc.measure(a, c_ancilla) self._circuit = qc return self._circuit