Questions tagged [qiskit]

Quantum Software Development Kit for writing quantum computing experiments, programs, and applications. If appropriate, also use the [programming] tag.

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AttributeError: 'Result' object has no attribute 'get_data'

Below is the code that I am trying to execute on Google Colab using Qiskit. I'll also paste the error that I am getting. Code ...
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A question about qiskit's WeightedPauliOperator.evolve method for IPEA (IQPE) implementation

I'm doing an implementation/tutorial of the iterative phase estimation algorithm (IPEA) and have a problem. My Hamiltonian is a diagonal matrix $H = \begin{pmatrix} E_1 & 0 \\ 0 & E_2\end{...
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Number of columns mismatch

So I have the following code qgan = QGAN(real_data, bounds, num_qubits, batch_size, num_epochs, snapshot_dir=None) with num qubits being defined as ...
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Why can different technology transpile the quantum gate to different representations?

I saw that qiskit was just incorporated in a trapped ion device. I transpiled my circuit to 2 backends: ibm superconducting device and aqt trapped ion device. I noticed that for ibm, the $X$ gate is ...
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QISKit Connection

I ve beeen trying to use the qiskit package from spyder IDE inisde anaconda (Python version 3.7) but when i try to acces my account I get the following error: ...
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Why is there only one line for the classical register?

So I am wondering why this "Quantum Teleportation Algorithm" from Qiskit - Programming on Quantum Computers Ep 5 is represented differently when I draw it (on the left in the image above) compared to ...
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IBM Q experience - error code 520

I have been running a variational circuit optimizing the parameters on the "melbourne" device. The system launches multiple jobs in parallel, and only gets the jobs accepted that my credit allows. The ...
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What does the error rate on the IBMQ website mean?

How is the error rate pointed by the arrow defined? How did you get it? thanks!
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224 views

Quantum random number generator

Can we generate quantum random numbers through Qiskit? I want to try the random number generator without using optics or noise.
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OpenPulse: Where to get current pulse definitions for standard gates?

Is backend.defaults().cmd_def and backend.defaults().pulse_library kept updated regularly? Is this the correct place to pull the best calibrated pulses for the standard gates? I am working on a ...
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Getting a layout for qubits in Qiskit

I'm trying to use Qiskit's built in transpiler passes to do the following. I would like to take a quantum circuit and allocate the logical qubits to physical qubits. The tutorial doesn't really ...
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How to specify the CNOT gate direction (control qubit to target qubit) in Qiskit?

If I act a CNOT gate on quantum circuit: from qiskit import QuantumCircuit qc = QuantumCircuit(2, 2) qc.cx(0, 1) it means that qubit_0 is the control qubit, and ...
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Is there a way to output a circuit from Qiskit to the IBM Q Experience circuit composer?

I can't seem to find anything, but this seems like something that should be possible.
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How does batching work in the optimizer loop of the VQC algorithm in Qiskit Aqua?

I've playing around with a binary classification problem with a dataset of size 1000 examples and 5 features. I'm using the VQC algorithm from the Qiskit package the that uses a feature map and a ...
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Ripple Adder using Full Adder [closed]

I have been trying to implement a ripple carry adder using qsikit in IBM Q Experience. I was able to implement full carry adder but I am having trouble with ripple carry adder. I am able to add 100 + ...
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Understanding quantum teleportation algorithm from qiskit tutorials

I am very new to quantum computing and I have recently started to experiment with qiskit module in python, by following tutorials and implementing simple algorithms....
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Can't access IBMQ (NameError: name 'IBMQ' is not defined)

When I type this: IBMQ.load_account(), I am getting this error. What does this mean, and how can I rectify it? ...
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1answer
142 views

Couldn't connect to IBMQ server

When I access IBM Q backend with qiskit code, an error occurs. from qiskit import IBMQ qt = 'xxxxxxxxx' IBMQ.save_account(qt) IBMQ.load_accounts() The error ...
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330 views

Qiskit installation failing: VC++ 2017 not found

I tried to follow the web instructions to load Qiskit, including VC++ 2017 Redistributable, but I get many errors upon installation. The gist seems to be that VC++ 2017 wasn't found. Some results ...
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How can I implement a kraus_error in qiskit?

I have successfully run bit_flip_error in Qiskit by function pauli_error, but I can not find how to implement a ...
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What is the URL of the result?

This answer states that: Once it is submitted, your job will be in queue. You will have to request by GET this job ID to get the answer from the backend. The GET URL is: https://quantumexperience....
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How good is basic_device_noise_model() simulating the noise in the quantum computer?

Is there any paper or article about the performance of the noise model using basic_device_noise_model()? For example, like the noise model in the code below. ...
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Exponentiating Hermitian Matrix for use in QPE/HHL

I am currently trying to understand HHL by implementing a very inefficient Qiskit simulation script that performs HHL on an arbitrary hermitian matrix $A$ and a vector $b$. Because I am currently ...
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247 views

How to draw Qiskit's HHL algorithm as a circuit?

Qiskit Aqua has a module that implements the HHL algorithm: https://qiskit.org/documentation/_modules/qiskit/aqua/algorithms/single_sample/hhl/hhl.html How does one draw the implemented circuit? * ...
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Vary parameter between shots

Is it possible to tell Qiskit to execute a parameterized gate where the parameter varies between shots? Let's say, for whatever reason, I'd like to speed up the dephasing of a qubit during a run. I ...
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100 views

Why is the order reversed on measurement?

Why is the order reversed on measurement? ...
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1answer
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qiskit - Creating your own ExperimentResultData object

Could someone guide me on how to create my own qiskit.result.models.ExperimentResultData object? I would simply like to create an object with some self-created dict ...
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1answer
62 views

Strange circuit with multi-qubit 'unitary' gates after transpiler with optimization level 3

Recently, I used the transpile() function with the level 3 preset pass manager to compile a very long and complex circuit on a real device coupling map. I was curious to see how much the depth of the ...
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How to decompose this two-qubit unitary matrix to the standard gate set?

I have read some of the other decomposition questions here however still don't understand how to do it manually. The matrix I wish to decompose is the following for 2 qubits: $M=\frac{1}{\sqrt2}\...
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In Grover, how to implement oracle and amplification using Qiskit?

I found some examples of implementing the oracle when the marked state is $|000\rangle$. But how can we know what gate we should use inside of the oracle? Besides, for the part implementation, the ...
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How does one get the attributes of a circuit from its DAG in qiskit?

I have the following code, which runs properly. ...
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586 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.
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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 ...
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2answers
80 views

How do you pass input to a circuit? [closed]

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?
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93 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\...
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What is the time zone for the time returned by backend.properties()?

For example, backend.properties() returns following: ...
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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. ...
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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,...
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1answer
141 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 ...
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1answer
166 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. ...
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112 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 ...
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1answer
132 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 ...
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1answer
85 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: ...
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140 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 ...
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38 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!
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1answer
146 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 ...
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2answers
186 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 + \...
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1answer
133 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 ...
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72 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 ...

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