Unanswered Questions
131 questions with no upvoted or accepted answers
2
votes
1
answer
165
views
Does Qiskit SamplerV2 change circuit depth?
I'm currently implementing some algorithms on IBM quantum devices. After the migration to qiskit 1.0, I started using primitives and SamplerV2.
What I observed is that even if I manually select a ...
CommunityBot
- 1
2
votes
0
answers
26
views
Running VQE code using qiskit_nature on IBM computers
$\texttt{qiskit_nature}$ no longer has the $\texttt{runtime}$ feature and $\texttt{VQEClient}$ function that was used to run a VQE code on one of the IBM computers. I could not find any easy migration ...
2
votes
0
answers
42
views
Controlled Ry gate on IBM and IonQ basis gates
As far as I know the basis gates for IBM and IonQ are:
IBM: ['cx', 'id', 'rz', 'x', 'sx']
IonQ: ['rx', 'ry', 'rz', 'rxx', 'id']
I used qiskit.transpile to see check how Controlled Ry gate can be ...
- 14.9k
2
votes
0
answers
82
views
Quantum Annealing on IBMQ using Qiskit-Pulse
Qiskit-Pulse is the analog level control SDK of IBMQ hardware. Is it possible to implement an adiabatic annealing protocol/algorithm on IBMQ hardware using Qiskit-Pulse?
Not asking about QAOA, which I ...
2
votes
0
answers
48
views
Exploiting virtual-$Z_{\theta}$ corrections in QEC
The work done by IBM Researchers to perform virtual-$Z_{\theta}$ gates allowed them to:
achieving zero-time relative phase shifts;
correcting $Z_{\phi}$ errors occurring when applying some gates -- e....
- 2,058
2
votes
0
answers
59
views
A path towards building quantum Computing graduation project for undergraduates
I need help. I'm a computer science student with a Data science major. I have a final graduation project this year. With that, I want to create a project in the Quantum computing field. I'm already ...
2
votes
0
answers
235
views
Calculating the Inner Product using Quantum Phase Estimation
I'm following the method laid out in https://arxiv.org/abs/2011.03429 (Page 23 Equations 13-23) to calculate the inner product of two amplitude embedded vectors using Quantum Phase Estimation. I'm ...
- 4,614
2
votes
0
answers
229
views
How to formulate QUBO as summation quadratic and linear parts of K-graph coloring problem?
While trying to understand the graph coloring problem with VQE using the QUBO Formulation mentioned section "5.2 Graph Coloring". Mentioned article prepared the QUBO directly in to matrix ...
2
votes
0
answers
148
views
Eigenvalues and energy levels of 1D Heisenberg model using real Quantum Computers?
The 1D Quantum Heisenberg model is
$$H_\textrm{Heisenberg} = -~J \sum_{\langle i\ j\rangle} \hat{S}_{i} \cdot \hat{S}_{j}$$
where each spin is an operator.
For simple cases, for example, a system with ...
- 3,109
2
votes
0
answers
317
views
How can I add custom pulse gate to the Qiskit circuit?
I tried to make my pulse and get the pulse into the circuit. But it seems not working properly.
The code and the result are below.
Just change the 'x' to the 'h' (hadamard) with the same piecewise ...
- 14.9k
2
votes
0
answers
66
views
Does dedicated mode provide better results than fairshare in mid-circuit measurement?
I'm using a research account and I have a question about running circuits with (dedicated/priority mode) and without reservation (fair-share mode). From the documentation of dedicated mode,
This (The ...
- 2,408
2
votes
0
answers
39
views
Recover qubits used in an actual computation
How do I recover from a certain job_id in the IBM backends which qubits where used?
I would be interested to know if for instance, in a batch of say 50 jobs, 25 of ...
glS♦
- 26.9k
2
votes
0
answers
450
views
How to do a POVM measurement of a quantum state in IBM's Quantum Composer?
I'm new to IBM, so I'm still figuring things out. I want to make a POVM measurement of a quantum state for state discrimination purposes. In other words I want a measurement that has three outcomes:
A:...
- 1,416
2
votes
0
answers
111
views
Length / transpilation issues with Grover's algorithm
I would like to discuss the discrepancies between what we see in the simulator versus what we see in the actual running of the code on any IBMQ machine for any qubits at 5 or above. I am doing a final ...
glS♦
- 26.9k
2
votes
0
answers
145
views
What is the buffer time between gates of the ibmq_essex in nanoseconds?
This is a question that I asked on Qiskit ignis section of slack, with a very interesting answer by A Kapila, but I also need to get a short answer in nanoseconds.
I want to evaluate decoherence in ...
- 76