Questions tagged [qiskit]
Quantum Software Development Kit for writing quantum computing experiments, programs, and applications. If appropriate, also use the [programming] tag.
204
questions
-1
votes
1answer
41 views
Problem in installing Qiskit
When I try to install Qiskit using Pip install Qiskit I get the error as shown in the attached snapshot.
Any help will be highly appreciated.
-1
votes
0answers
26 views
Problems in installing Qiskit
I am trying to install Qiskit in ubuntu 16.04.
I have installed Anaconda.
When i do 'conda list' in my environment I see the packages, the photo of which I am attaching with this post.
But when I ...
2
votes
1answer
38 views
Quantum pricing of financial derivatives (call option) in Qiskit Aqua
In finance, a European call gives the buyer the right to buy some underlying asset such as a stock at some pre-determined strike price at a specific expiration date. The Black-Scholes equation is a ...
-1
votes
2answers
48 views
How do you pass input to a circuit?
I've implemented Grover's search algorithm in qiskit, and I'd like to pass in an input to run through the circuit. How is that done?
1
vote
1answer
76 views
Trying to make irreversable operation in the quantum circuit
I want to make a 2 qubit circuit such that the non-unitary program will transform the regular basis in the way that:
$|0 0\rangle \to |00\rangle$
$|0 1\rangle \to |01\rangle$
$|10\rangle \to |01\...
0
votes
1answer
32 views
What is the time zone for the time returned by backend.properties()?
For example, backend.properties() returns following:
...
1
vote
2answers
53 views
How do I find out which stable Python version Qiskit will be compatible to?
Recently I've got a new machine and had to start over again (Qiskit installation).
As this was not my first time in creating a Qiskit environment on Anaconda, I was able to work out the errors.
...
1
vote
0answers
41 views
Many jobs hanging after creating
I am running a VQE calculation running from a cluster using nohup.
However, some of my jobs keep hanging with 'creating' and therefore my VQE is not converging/not working.
However, at the same time,...
2
votes
1answer
62 views
What is the location of the Qiskit config file?
I'm trying to follow the instructions here https://qiskit.org/documentation/getting_started.html. It says
The default backend for qiskit.visualization.circuit_drawer() or
QuantumCircuit.draw() is ...
2
votes
1answer
136 views
In qiskit, doing 2 subsequent measurements of a Hadamard gate on the same qubit always gives 0 on the 2nd one
When I execute the following circuit, I expect that in both classical registers, the content is identical.
...
2
votes
0answers
70 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 ...
1
vote
1answer
34 views
Attribute error in Qiskit
Tried executing plot_histogram(result.get_counts(circuit))
where result has the job result and circuit is the Quantum circuit
But an attribute error hits every ...
2
votes
1answer
49 views
Error on loading account with qiskit: “TypeError: __init__() missing 1 required positional argument: 'url'”
We are using an open account.
We can not load the account even when we use the code on new notebook.
The error message is:
...
4
votes
1answer
101 views
How to parallelly run a quantum circuit on IBMQ?
I am trying to implement the following circuit
and my code is
The above circuit has size 5 and depth 3. My question is, how can I run the circuit parallelly. I mean, the gate ...
1
vote
0answers
35 views
Suggestions for hybrid factoring algorithm on DWave and Qiskit
I was wondering if the multi-prime factoring problem can be solved in a hybrid approach using DWave (to factor) and Shor's algorithm (in Qiskit)? Please let me know your thoughts.
Thanks!
4
votes
1answer
57 views
How to selectively apply noise in Qiskit simulations?
In Qiskit it is possible to specify noise models to apply to simulations. This allows noise to be defined for certain operations, like measurement or each type of gate.
Is it also possible to change ...
2
votes
2answers
112 views
How to prepare a specific initial state of three qubits?
I would like to prepare the following initial state for variational quantum algorithms:
$$
\sin\theta_1 \sin\theta_2 \sin\theta_3 |000\rangle + \sin\theta_1 \sin\theta_2 \cos\theta_3 |001\rangle + \...
2
votes
1answer
45 views
Implementing noise model in Qiskit using arbitrary basis gates
Consider the simplified code below. The code creates a quantum circuit and a simplified noise model.
When I try to simulate this circuit using the noise model I get error message that the simulation ...
4
votes
1answer
66 views
Resources in Spanish to start learning quantum computing and quantum programming (Qiskit)
I’m starting an engineering degree in computer systems and I’m starting to get really interested in quantum computing. First of all, I don’t know where or how to start and I would really like to learn ...
3
votes
0answers
47 views
`execute()` hangs and eats memory
Used memory-profiler to check why I get memory spikes in what I though were small circuits. The circuit itself is constructed using ...
2
votes
1answer
59 views
How many ancilla qubits to use with Multiple-Control Toffoli (mct) gate in Qiskit?
The Multiple-Control Toffoli (mct) gate takes as input:
1. a register containing the control qubits,
2. the target qubits and
3. a register containing ancilla qubits.
I don't know how many ...
1
vote
0answers
49 views
'ERROR: QasmSimulator: Circuit cannot be run using available methods.'
I used the following code. Can anyone say what that error is about?
...
2
votes
1answer
60 views
When I load a saved account, I get a license-agreement error (links to old website)
I cobbled together a few programs with Qiskit several months back which worked fine on both the BasicAer simulators and the actual IBMQ computers. However, when I tried to revisit them recently, ...
3
votes
0answers
49 views
Is there a way to develop a multiple controlled X or Z gate on Qiskit without using ancillary qubits?
I know for instance I can derive a cccX gate using 2 Toffoli gates on 5 qubit wire or ccccX with 3 Toffoli gates and 7 qubits and so on. you will notice the depth is increasing as the number of ...
-3
votes
1answer
119 views
Exploring quantum computing with Qiskit [closed]
I'm prepared to explore quantum computing which is completely new to me. Searching for a while on the Internet, I found IBM Qiskit which is an Open Source software necessitated for Quantum Computing. ...
3
votes
1answer
198 views
What is a “barrier” in Qiskit circuits?
I just started studying IBM Qiskit, and cannot find details about the barrier method on the QuantumCircuit class. It is shown in the circuit drawing, but I never heard about it after reading quantum ...
2
votes
1answer
43 views
n-qubit circuit run with > n qubits?
I was reading the Qiskit tutorial on circuit properties and there is a section (Unitary Factors) which states that even though an example circuit is made of 12 qubits, it may not need 12 qubits to run....
-1
votes
1answer
62 views
What is ''524 Server Error''?
When running my code, sometimes I find this 524 Server Error: Origin Time-out for url and then my code stop. The error is in ...
0
votes
1answer
33 views
Quantum Circuit Properties typo (documentation bug?)
Just to report that the notebook "Quantum Circuit Properties" under the Tutorial uses a circuit named qc2 but afterwards the sample code still uses the ...
3
votes
3answers
100 views
How to plot custom gate labels in Qiskit?
How can I create a custom gate in qiskit that is plotted using latex formatting (or another type of formatting)? For example the following code generates a circuit diagram
...
4
votes
0answers
183 views
Is it possible to run a general implementation Shor's algorithm on a real IBM quantum computer at least for N = 15?
I need to make a general implementation of Shor's algorithm that factors, at least, N = 15. I have been able to perform an implementation that works in simulators, with ProjectQ, but when running it ...
2
votes
1answer
72 views
QAOA Maxcut for larger qubits
I am using QAOA to solve maxcut problem. It takes a very long time to simulate 10 qubits and I never get the results. Is there a way to simulate faster for larger qubit?
Here is my code
...
1
vote
3answers
96 views
How many classical registers are there on (IBM) quantum computers?
I have a circuit where I only use 3 qubits but need to utilize hundreds of classical registers. My questions are: what is the maximum number of classical bits on the current IBM Qs? What is the ...
2
votes
2answers
100 views
How to unpickle a Result object returned by an IBMQ experiment?
I have executed an experiment using IBMQ and receive a Result object.
I am writing the ASCII repr of the result with f.write(res)...
2
votes
1answer
63 views
How can we construct a square root of NOT gate in Qiskit and IBMQ circuit composer using universal gates?
I have tried it with decomposing controlled S then conjugating with H gate. But I want to construct it using a minimum number of gates.
-2
votes
1answer
90 views
2
votes
1answer
65 views
In Qiskit, when creating multi-bit quantum and classical registers, what is the ordering of MSB to LSB?
When creating multi-bit quantum and classical registers, what is the ordering of MSB to LSB? For instance, I created a quantum register via
...
2
votes
0answers
49 views
Is it possible to simulate or replicate a cryptographic algorithm using Qiskit?
I would like to know if it is possible to recreate or simulate a cryptographic encryption algorithm like DES or AES using the quantum computing platform Qiskit from IBM?
2
votes
0answers
50 views
Running HHL tutorial on real backend
I tried to follow the HHL tutorial. Since the 8x8 problem is not realistically simulable (I stopped after a few minutes), I tried to make it run on another backend, starting on the easiest example:
<...
1
vote
1answer
76 views
Backend Warning: The skip Qobj validation does not work for IBMQ provider. Disable it
I am using QAOA to solve the max-cut problem. On my machine, 10 qubits already takes a minute or two to simulate. I'm hoping that the ibmq-qasm-simulator could simulate 32 qubits faster than my laptop ...
1
vote
1answer
42 views
Question on using the Collect2qBlocks() and ConsolidateBlocks() optimizations
I'd like to run the optimizations from Qiskit's level 3 transpiler pass on some example programs for benchmarking, but when I try to include the Collect2qBlocks() and ConsolidateBlocks() passes I get ...
3
votes
2answers
127 views
Big Endian vs. Little Endian in Qiskit
I've noticed that Q# favors Little Endian. Meaning that most operations are designed for this type of encoding.
Is is it the same with Qiskit?
1
vote
3answers
160 views
Cirq, qiskit, q#, ibmq(circuit board), other [closed]
Which platform is the best for programming quantum computers?
Which one is your personal favourite?
If other mention which one it is and if possible few resources for it.
2
votes
3answers
72 views
AttributeError: 'AerJob' object has no attribute 'get_counts'
result = execute(circuit, backend=simulator)
plot_histogram(result.get_counts(circuit))
I used the above code to plot a histogram for a simple entanglement ...
1
vote
1answer
53 views
How to understand run_algorithm() inputs in qiskit
I'd like to better understand the Max-Cut algorithm from the qiskit tutorials. Particularly, the run_algorithm function inputs. The inputs are two dictionaries, but I can't find any documentation or ...
2
votes
1answer
69 views
IBMQ.load_account from stored ACCOUNT is failing on Qiskit 0.9.0
The following statement is causing an error in Qiskit Version 0.9.0:
provider = IBMQ.load_account()
Error Message:
...
1
vote
2answers
138 views
How to get amplitudes only for chosen qubits?
For computation, I use N working qubits and M ancilla qubits.
...
2
votes
2answers
81 views
In Grover's Algorithm, does the exact solution need to be given to the oracle?
From my understanding, the oracle function in Grover's algorithm is used as a way to check for the desired outcome.
I have looked at this example which implements the Exactly-1 3-SAT problem and the ...
0
votes
1answer
87 views
Qiskit plot_histogram and count not working
im trying to plot a histogram of my code but when i run
plot_histogram(results.get_counts(circuit)) it gives me a traceback error
This is what i had before calling ...
0
votes
1answer
113 views
How to obtain qubit's amplitude in qiskit
For example, I have some circuit
circuit = QuantumCircuit(2)
After operations:
circuit.h(0)
circuit.cx(0, 1)
probability ...
