SaveExpectationValueVariance¶
- class SaveExpectationValueVariance(operator, label='expectation_value_variance', unnormalized=False, pershot=False, conditional=False)[소스]¶
기반 클래스:
SaveAverageData
Save expectation value and variance of an operator.
Instruction to save the expectation value and variance of a Hermitian operator.
The expectation value of a Hermitian operator \(H\) for a simulator in quantum state :math`rho`is given by \(\langle H\rangle = \mbox{Tr}[H.\rho]\). The variance is given by \(\sigma^2 = \langle H^2 \rangle - \langle H \rangle>^2\).
- 매개변수
operator (Pauli or SparsePauliOp or Operator) – a Hermitian operator.
label (str) – the key for retrieving saved data from results.
unnormalized (bool) – If True return save the unnormalized accumulated or conditional accumulated expectation value over all shot [Default: False].
pershot (bool) – if True save a list of expectation values for each shot of the simulation rather than the average over all shots [Default: False].
conditional (bool) – if True save the average or pershot data conditional on the current classical register values [Default: False].
- 예외 발생
ExtensionError – if the input operator is invalid or not Hermitian.
참고
This instruction can be directly appended to a circuit using the
save_expectation_value()
circuit method.Methods
Add a decomposition of the instruction to the SessionEquivalenceLibrary.
Return the QasmQobjInstruction for the intructions.
Validation of the arguments.
Set a classical equality condition on this instruction between the register or cbit
classical
and valueval
.Copy of the instruction.
Special case.
Return True .IFF.
Return a default OpenQASM string for the instruction.
Creates an instruction with gate repeated n amount of times.
For a composite instruction, reverse the order of sub-instructions.
Soft comparison between gates.
Instruction parameters has no validation or normalization.
Attributes
- 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
- 반환 형식
str
- 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.