HamiltonianGate#

class qiskit.extensions.HamiltonianGate(data, time, label=None)[source]#

Bases: Gate

Class for representing evolution by a Hamiltonian operator as a gate.

This gate resolves to a UnitaryGate as \(U(t) = exp(-i t H)\), which can be decomposed into basis gates if it is 2 qubits or less, or simulated directly in Aer for more qubits. Note that you can also directly use QuantumCircuit.hamiltonian().

Create a gate from a hamiltonian operator and evolution time parameter t

প্যারামিটার:

data (matrix or Operator) -- a hermitian operator.
time (float or ParameterExpression) -- time evolution parameter.
label (str) -- unitary name for backend [Default: None].

রেইজেস:

ExtensionError -- if input data is not an N-qubit unitary operator.

Attributes

condition_bits#: Get Clbits in condition.

decompositions#: Get the decompositions of the instruction from the SessionEquivalenceLibrary.

definition#: Return definition in terms of other basic gates.

duration#: Get the duration.

label#: Return instruction label

name#: Return the name.

num_clbits#: Return the number of clbits.

num_qubits#: Return the number of qubits.

params#: return instruction params.

unit#: Get the time unit of duration.

Methods

add_decomposition(decomposition)#: Add a decomposition of the instruction to the SessionEquivalenceLibrary.

adjoint()[source]#: Return the adjoint of the unitary.

assemble()#: Assemble a QasmQobjInstruction

broadcast_arguments(qargs, cargs)#

Validation and handling of the arguments and its relationship.

For example, cx([q[0],q[1]], q[2]) means cx(q[0], q[2]); cx(q[1], q[2]). This method yields the arguments in the right grouping. In the given example:

in: [[q[0],q[1]], q[2]],[]
outs: [q[0], q[2]], []
      [q[1], q[2]], []

The general broadcasting rules are:

If len(qargs) == 1:
```
[q[0], q[1]] -> [q[0]],[q[1]]
```

If len(qargs) == 2:

[[q[0], q[1]], [r[0], r[1]]] -> [q[0], r[0]], [q[1], r[1]]
[[q[0]], [r[0], r[1]]]       -> [q[0], r[0]], [q[0], r[1]]
[[q[0], q[1]], [r[0]]]       -> [q[0], r[0]], [q[1], r[0]]

If len(qargs) >= 3:

[q[0], q[1]], [r[0], r[1]],  ...] -> [q[0], r[0], ...], [q[1], r[1], ...]

প্যারামিটার:

qargs (list) -- List of quantum bit arguments.
cargs (list) -- List of classical bit arguments.

রিটার্নস:

A tuple with single arguments.

রেইজেস:

CircuitError -- If the input is not valid. For example, the number of arguments does not match the gate expectation.

রিটার্ন টাইপ:

Iterable[tuple[list, list]]

c_if(classical, val)#: Set a classical equality condition on this instruction between the register or cbit classical and value val.

নোট

This is a setter method, not an additive one. Calling this multiple times will silently override any previously set condition; it does not stack.

conjugate()[source]#: Return the conjugate of the Hamiltonian.

control(num_ctrl_qubits=1, label=None, ctrl_state=None)#

Return controlled version of gate. See ControlledGate for usage.

প্যারামিটার:

num_ctrl_qubits (int) -- number of controls to add to gate (default: 1)
label (str | None) -- optional gate label
ctrl_state (int | str | None) -- The control state in decimal or as a bitstring (e.g. '111'). If None, use 2**num_ctrl_qubits-1.

রিটার্নস:

Controlled version of gate. This default algorithm uses num_ctrl_qubits-1 ancilla qubits so returns a gate of size num_qubits + 2*num_ctrl_qubits - 1.

রিটার্ন টাইপ:

qiskit.circuit.ControlledGate

রেইজেস:

QiskitError -- unrecognized mode or invalid ctrl_state

copy(name=None)#

Copy of the instruction.

প্যারামিটার:: name (str) -- name to be given to the copied circuit, if None then the name stays the same.
রিটার্নস:: a copy of the current instruction, with the name updated if it was provided
রিটার্ন টাইপ:: qiskit.circuit.Instruction

inverse()[source]#: Return the adjoint of the unitary.

is_parameterized()#: Return True .IFF. instruction is parameterized else False

power(exponent)#

Creates a unitary gate as gate^exponent.

প্যারামিটার:: exponent (float) -- Gate^exponent
রিটার্নস:: To which to_matrix is self.to_matrix^exponent.
রিটার্ন টাইপ:: qiskit.extensions.UnitaryGate
রেইজেস:: CircuitError -- If Gate is not unitary

qasm()[source]#: Raise an error, as QASM is not defined for the HamiltonianGate.

0.25.0 ভার্সন থেকে ডেপ্রিকেটেড: The method qiskit.extensions.hamiltonian_gate.HamiltonianGate.qasm() is deprecated as of qiskit-terra 0.25.0. It will be removed no earlier than 3 months after the release date.

repeat(n)#

Creates an instruction with gate repeated n amount of times.

প্যারামিটার:: n (int) -- Number of times to repeat the instruction
রিটার্নস:: Containing the definition.
রিটার্ন টাইপ:: qiskit.circuit.Instruction
রেইজেস:: CircuitError -- If n < 1.

reverse_ops()#

For a composite instruction, reverse the order of sub-instructions.

This is done by recursively reversing all sub-instructions. It does not invert any gate.

রিটার্নস:

a new instruction with: sub-instructions reversed.

রিটার্ন টাইপ:

qiskit.circuit.Instruction

soft_compare(other)#

Soft comparison between gates. Their names, number of qubits, and classical bit numbers must match. The number of parameters must match. Each parameter is compared. If one is a ParameterExpression then it is not taken into account.

প্যারামিটার:: other (instruction) -- other instruction.
রিটার্নস:: are self and other equal up to parameter expressions.
রিটার্ন টাইপ:: bool

to_matrix()#

Return a Numpy.array for the gate unitary matrix.

রিটার্নস:: if the Gate subclass has a matrix definition.
রিটার্ন টাইপ:: np.ndarray
রেইজেস:: CircuitError -- If a Gate subclass does not implement this method an exception will be raised when this base class method is called.

transpose()[source]#: Return the transpose of the Hamiltonian.

validate_parameter(parameter)[source]#: Hamiltonian parameter has to be an ndarray, operator or float.