All Questions
Tagged with error-correction qiskit
59
questions
1
vote
0
answers
41
views
How to implement fault tolerant cat state construction with qiskit?
I want to build a fault-tolerant error correction gadget in qiskit. As a part of that, I want to construct cat states (for the syndrome measurements) in a fault-tolerant way.
One way to do this, is to ...
- 745
1
vote
1
answer
97
views
Is this quantum circuit design more prone to noise?
I am designing a quantum circuit which uses one qubit as the control of many $\text{CSWAP}$ operations. And then, this qubit will be measured.
Will the result be more prone to noise since all the ...
- 121
1
vote
2
answers
94
views
Error while plotting the resulting distribution
I am using this code, as a test of my qiskit, but I am having errors on using the simulator
Building the circuit
We begin by importing Qiskit.
from qiskit import *
...
- 11
1
vote
0
answers
20
views
How to model the IBM quantum errors?
I'm conducting a study of the quantum channel errors, and a question has arisen: Is it possible to model the errors of an IBM quantum computer with Kraus operators?
3
votes
0
answers
37
views
Does qiskit make any rounding errors or anything similar, or is it a perfect (but slow) simulation of a quantum computer?
I ran the following circuit to calculate the real part of the Bargmann Invariant of a system of quantum states. The invariant is defined as
...
1
vote
1
answer
159
views
How to fix two flip-bit errors in a 3 qubit input
Aware of how a 1-bit flip can be fixed for 3-qubit input by having 2 Ancilla bits, encoding, and using the Toffoli gate to fix the error and decode. How can this idea be extended for a 2-bit flip (...
- 69
1
vote
1
answer
239
views
Get parameters of a CU gate for implementing an erroneous CX gate with fidelity = 0.81
Let's say the definition of an erroneous CNOT gate is given as - CNOT is a 2-qubit quantum gate when the control qubit is at state 0, applies identity operation on the target qubit, when the control ...
- 69
3
votes
1
answer
134
views
Quantum error correction circuit from stabilizer codes
I am trying to familiarize myself with QEC codes and their use in quantum communication. Right now, I am trying to implement some more widely known codes in Qiskit. My main problem is I cannot wrap my ...
- 31
1
vote
1
answer
219
views
Simulating a small distance surface code with individual qubit addressing
I want to simulate a small-distance surface code with either STIM or Qiskit. I want individual control over all the qubits (including the ancillas) to induce controlled errors in my circuit. I want to ...
- 239
0
votes
1
answer
188
views
How to see the effects of the depolarizing channel in qiskit?
I am playing around with adding noise to quantum circuit simulation using qiskit_aer.noise.NoiseModel(). My code creates a quantum circuit and simulates it with ...
0
votes
1
answer
134
views
How to apply error-correction to the swap test circuit?
Swap test is a simple quantum circuit to measure the inner product of two quantum states [Wiki: swap test], it only contains three quantum gates. However, due to the error in the real quantum computer ...
- 365
0
votes
1
answer
224
views
How to implement Shor's 9-Qubit-Code in Qiskit?
I am new to qiskit and currently trying to implement Shor's 9-Qubit_Code. I am trying to orient my code on the example given in the official qiskit-tutorial and so far I have the following:
...
- 173
2
votes
1
answer
177
views
Are there qiskit or stim examples of how to decode a subsystem code
I can manage decoding a stabilizer code in qiskit and stim. I'd like to try a subsystem code next. For a stabilizer code, all stabilizers commute so simultaneous measurement of these produces ...
- 2,217
1
vote
1
answer
52
views
How to best represent 5-Qbit codeword operator in Qiskit [duplicate]
We learned that in the 5-Qibit error correcting code, the logical zero state $ | \bar{0} \rangle $ is encoded in the form of $ \frac{1}{4} (\mathbb{1}+M_0)(\mathbb{1}+M_1)(\mathbb{1}+M_2)(\mathbb{1}+...
- 599
1
vote
0
answers
39
views
1
vote
1
answer
194
views
Measurement of readout errors for error mitigation algorithms
I am using an error mitigation algorithm that uses the readout errors p(0|1) and p(1|0) to correct the errors due to noise in my original circuit. I am trying to measure the readout errors in the same ...
- 199
1
vote
1
answer
197
views
Logical error rate for QECC using qiskit
I've been coding QECC with qiskit recently. As I'm not very skilled in programming I encountered a lot of questions.
Now I'm trying to generate the logical error rate against physical error rate graph ...
- 386
0
votes
0
answers
182
views
Qiskit, possible to manipulate mid-circuit measurement outcomes?
I'm currently coding up an error correction gadget using qiskit.
The one I'm doing now is 7-qubit Steane code with Steane's error correction gadget, in which the ancilla qubits are measured and then ...
- 386
2
votes
1
answer
446
views
Estimate of threshold values for 7-qubit Steane code with qiskit (or stim)
I have trouble recreating the graphs shown in this paper
https://arxiv.org/pdf/quant-ph/0508176.pdf
i.e. the quadratic trend of the logical error against physical single qubit error for [7,1,3] code
I ...
- 386
1
vote
0
answers
78
views
Why QECC amplitude damping error syndrome and qiskit simulation are different?
The [[3,0,2]] code, stabilizers are X1Z2I3,Z1X2Z3,I1Z2X3.
Use the circuit to decode and measure stabilizers:
As for amplitude damping error syndrome, use $\left[\begin{array}{cc}1 & 0 \\ 0 & ...
- 21
4
votes
1
answer
510
views
How the real IBM quantum computers apply arbitrary Rz(θ) gate rotation? [closed]
I want to ask the following questions:
(1) The basis gate set of IBM quantum computers is { Id, Rz(θ),√X, X, CNOT, reset}. Somebody said that IBM didn’t really apply Rz(θ) gate on the machine. The ...
- 95
1
vote
1
answer
269
views
How to interface stim to a generic qiskit decoder?
I can generate encoder/decoder circuits for arbitrary QECC in qiskit. I tested a number of codes : $[[5,1,3]], [[7,1,3]],[[8,3,3]],\cdots$ and everything seems to work fine. The problem is that the ...
- 2,217
3
votes
1
answer
416
views
is cirq suitable for simulation of quantum error correction?
I experimented with stim and qiskit for QECC simulations. They both have limitations : for example stim has no support for non-clifford operations (qiskit does); qiskit has no support for multiple ...
- 2,217
1
vote
1
answer
437
views
how to go from matrix to tableau to circuit in qiskit or stim
I'm working with QECC using a non-python based platform. I'd like to move the results into python to do calculations that are better handled by packages like qiskit or stim. So the output of the non-...
- 2,217
3
votes
1
answer
150
views
How to set the meas_level and optimization_level in Quantum Azure IonQ provider?
I am performing a benchmark process using the Azure Quantum IonQ provider. I use Qiskit in the Azure platform, and I was trying to see how to control the transpiling and compiling process. It seems ...
- 284
1
vote
2
answers
155
views
The statevector of three-qubit bit-flip encoding circuit for entangled state
I was trying to implement a three-qubit bit-flip code for shared entangled state. I was curious to analyze this mathematically, but the problem is I can't calculate the statevector after encoding. ...
- 374
0
votes
0
answers
59
views
How to set up a error detection and correction scheme on qiskit
Does, at the state of the art, Qiskit allows to do error detection and correction?
If yes, how can I do it?
- 1,998
1
vote
1
answer
242
views
Information about the output of %qiskit_backend_overview
Does anyone know where can I find more information about the meaning of some parameters outputted by %qiskit_backend_overview ? I mostly refer to "Avg. T1/T2&...
0
votes
1
answer
80
views
Is it possible for public users to run experiments using Qiskit's surface code?
I'm an undergrad who would like to run some experiments using the surface code. I've been able to use their quantum repetition code (https://qiskit.org/textbook/ch-quantum-hardware/error-correction-...
- 103
4
votes
2
answers
247
views
Why aren’t repetition codes used to encode qubits in superposition states?
I just finished reading the section of the qiskit textbook on quantum error correction using repetition codes(https://qiskit.org/textbook/ch-quantum-hardware/error-correction-repetition-code.html) and ...
- 103