Unanswered Questions
105 questions with no upvoted or accepted answers
6
votes
0
answers
278
views
Quantum State Tomography Implementation in IBMQ
I am working to understand quantum state tomography, specifically using the algorithm presented in PRL 108, 070502. This paper is referenced in IBMQ implementations of QST, both in old deprecated ...
6
votes
0
answers
141
views
Bell State 11 not working for parity curve
I am currently writing a script to automate the creation of parity curves for a 2 qubit bell state and then calculate fidelity and proving entanglement from that (inspired by this paper). It was going ...
glS♦
- 26.9k
5
votes
0
answers
271
views
How to get the compiled circuits and measurements from a Qiskit Runtime job
I have not been able to find any way to retrieve the compiled circuits and the measurement counts used for a Qiskit Runtime job. This page describes the various error suppression mechanisms available. ...
- 726
5
votes
0
answers
113
views
What is the best way to use loop statements on a quantum computer?
I am interested in solving a time dependent linear partial differential equation of the form $Ax=b$ which, in classical computing, would amount to looping over solutions of $Ax=b$ where $b$ is updated ...
glS♦
- 26.9k
5
votes
0
answers
160
views
Results from looped experiments on IBM Q different than individual experiments
I'm experiencing an issue while using Qiskit where the counts from a job return vastly different values when ran in a loop or as an array of circuits as opposed to single experiments when run by ...
- 17.8k
4
votes
0
answers
361
views
Implementing Shor's algorithm on IBM Quantum Composer
I'm trying to recreate
from this paper in the IBM Quantum Composer. However, this circuit isn't enough understandable for me to do so.
I have tried to recreate the above circuit in the composer as ...
- 157
4
votes
0
answers
86
views
Incorrect probabilities in IBMQ Mid-circuit measurements
I calculated the probabilities for two measurements using mid-circuit measurements feature in IBMQ by following circuit:
...
- 577
4
votes
0
answers
72
views
What is the actual precision of the IBM quantum computer?
In working with the IBM quantum computer, one can use for example the composer in order to build simple quantum algorithms. Essentially, one usually feeds a phase in order to affect one of the qubits. ...
- 641
4
votes
0
answers
69
views
Adding team to our IBM Quantum Experience account
I have an account and API token on IBM Quantum Experience (https://quantum-computing.ibm.com/)
I would like to add team members to the account, so that everyone can use it without sharing login ...
4
votes
0
answers
161
views
Transpiler fails after 1000 iterations
I'm transpiling a set of quantum circuits using ibmq_5_yorktown. However, as the number of circuits gets larger, it shows me the following error message:
...
- 2,408
4
votes
0
answers
82
views
IBM QE - Parameters that differentiate the various backends
I'm doing a university thesis using IBM's quantum backends. In my analysis I am making some considerations on what differentiates one backend from another other than the number of qubits and quantum ...
- 51
4
votes
0
answers
146
views
Form and effect of the intrinsic Hamiltonian on the IBM machines
I want to understand the form of the intrinsic Hamiltonian of the IBM machines, such as ibmq_16_melbourne, and how this affects the data I get out when waiting ...
4
votes
0
answers
335
views
Problem with measurement error mitigation using VQE
I am attempting to mitigate measurement error while running on one of IBM's real devices and am doing so by passing CompleteMeasFitter into ...
4
votes
0
answers
563
views
Measuring Coherence Length for T1 and T2 values with IBMQ Experience
So I'm currently working on a little program to measure how long the coherence time of a qubit is. Basically the idea is to initialise a qubit with a X or H gate then stick in a varying amount of ...
glS♦
- 26.9k
4
votes
0
answers
480
views
Implementing a depolarizing channel for 2 qubits on IBM Q
I am trying to use IBM Q to perform the following depolarizing channel on a state of 2 qubits $\rho=|\psi \rangle \langle \psi |$:
$$\rho \to (1-\lambda)\rho + \frac{\lambda}{4}I$$
This is within ...
- 313