All Questions
Tagged with vqe circuit-construction
7 questions
2
votes
1
answer
82
views
Implementing cphase gate on IonQ through Amazon Braket
I am implementing a VQE algorithm where I need controlled phase gate as part of ansatz circuit. I am using Amazon Braket service. Ionq processor however does not support c-phase gate or phase gate. ...
- 35
2
votes
0
answers
85
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Efficient gate executing the time evolution of a Hamiltonian using Runge-Kutta method
You can find a minimal working example below.
In particular, I want to replace the scipy.linalg.expm() matrix exponential by a Runge Kutta time evolution method as ...
1
vote
1
answer
333
views
Commutativity of XY gate
My question is a simple one: Can 2 XY gates commute ?
XY gate is a 2-qubit XX+YY interaction also sometimes referred to as iSwap gate.
1
vote
0
answers
73
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Difference between using CircuitSampler vs Execute methods on obtaining expectation value
For a hybrid, VQE-type optimization in qiskit, in order to compute the expectation value of a Hamiltonian, we can use CircuitSampler on some Pauli sum operators, as well as Execute method on a list of ...
- 11
5
votes
1
answer
395
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Qiskit: QAOAnsatz circuit with custom Hamiltonian
I am trying to implement the Quantum Approximate Optimization Ansatz by creating a parametrized subcircuit
$$V (α) = e^{−iH_M α_1} e^{−iH_D b_1} ... e^{−iH_M α_n} e^{−iH_D b_n}$$
with the custom ...
- 361
2
votes
1
answer
308
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Decomposition of 2-qubit Hamiltonian into standard gate set for QAOA
I try to decompose ansatz into gate set in order to create a circuit in qiskit for QAOA algorithm.
I don't understand how represent parametrized 2 qubit ansatz as circuit.
$ H{_B} = \sum_{j=1}^{n} {\...
- 63
3
votes
1
answer
172
views
What is the best way to handle parametric circuits in Qiskit?
What is the best way to handle parametric circuits in Qiskit? When I create a variational form like TwoLocal and then do ...
- 878