Skip to main content

Questions tagged [error-mitigation]

For questions about QEM (Quantum Error Mitigation) which is different from Quantum Error Correction in that no extra qubits are used.

Filter by
Sorted by
Tagged with
8 votes
3 answers
1k views

What is the difference between Error Mitigation (EM) and Quantum Error Correction (QEC)?

From what I understood, EM is mostly post-processing and does not affect quantum circuit complexity whereas QEC has overheads and integrates as part of a quantum circuit. Is this correct? Also, which ...
MonteNero's user avatar
  • 2,684
8 votes
2 answers
501 views

Apply readout error mitigation to mid-circuit measurement

I'm trying to construct a quantum circuit with 3 mid-circuit measurements, here's an example: ...
ZR-'s user avatar
  • 2,398
5 votes
2 answers
678 views

What is the clear definition of coherent versus incoherent errors?

The noise types in quantum computing are pivotal topics frequently discussed in academic papers. Could you provide a clear definition of coherent versus incoherent errors? Additionally, I'm keen to ...
Yunjie Wang's user avatar
5 votes
1 answer
381 views

Is there a tutorial for error mitigation in qiskit that does not use the deprecated ignis?

Working through the qiskit text I have come accross measurement error mitigation a few times (Measurement Error Mitigation, Lab 3: Quantum Measurment,...]. In the online textbook the coding indicates ...
PGibbon's user avatar
  • 472
5 votes
1 answer
251 views

How is randomized compiling actually helpful: experimentally, a gate is not "perfect" followed by some noise acting "after"

I am currently learning randomized compiling with this paper which seems to be the "main" reference on this topic (at least many papers refer to this one). However, I do not understand how ...
Marco Fellous-Asiani's user avatar
5 votes
1 answer
178 views

Probabilistic error cancellation: how are we sure (i) the inverse noise *mathematically* exists, (ii) its expansion contains implementable operations

I am currently learning the basics of probabilistic error cancellation. The idea, in summary, is the following: We want to implement a quantum circuit having a noiseless (unitary) implementation $\...
Marco Fellous-Asiani's user avatar
5 votes
0 answers
643 views

Add noise_model when using 'ibmq_qasm_simulator' backend and provider.runtime.run() function

I am trying to test some qiskit code that employs readout-error mitigation using the ibmq_qasm_simulator backend and Qiskit Runtime. I am getting the backend as ...
Ruth V.'s user avatar
  • 51
5 votes
0 answers
127 views

Which improvements can we expect in Quantum Error Correction?

According to this article: The surface code is currently the most widely pursued quantum error correction scheme (Emphasis mine). It is also said: However, there are drawbacks to the surface code, ...
Tristan Nemoz's user avatar
  • 6,712
4 votes
3 answers
400 views

Why does making a quantum circuit more noise resilient make it easier to simulate classically?

I was reading Quantum Computing in the NISQ era and beyond (John Preskill, 2018) but I didn't get this point on pages 9-10: There is a substantial opportunity for experimentalists and theorists, ...
Fezudo's user avatar
  • 143
4 votes
1 answer
395 views

How can I add readout error in constructing a quantum noise model?

I'm trying to construct a quantum noise model with readout error only: qiskit.providers.aer.noise.NoiseModel.add_readout_error. However, when I try to specify the ...
ZR-'s user avatar
  • 2,398
4 votes
1 answer
178 views

Nyquist–Shannon sampling theorem for Quantum Evolution

In classical digital signal processing one can try to identify the dynamics of a system by sampling its evolution from an initial time $t_0$ to a final time $t_1$. Sampling $N$ times results in a ...
Marion's user avatar
  • 635
4 votes
1 answer
183 views

Filtering a set of results obtained from job manager

I've already generated a filter for readout error mitigation: ...
ZR-'s user avatar
  • 2,398
4 votes
1 answer
360 views

Am I doing anything wrong when trying to calculate the expectation value in Qiskit on the real hardware?

I am trying to use the method of calculating the expectation values of Pauli operators in Qiskit which I found here. However, the results obtained via IBMQ sampling differ significantly from the exact ...
stinglikeabeer's user avatar
4 votes
1 answer
180 views

Existing measurement error mitigation

Does IBM compute a measurement error mitigation calibration matrix that can be accessed from its device properties or somewhere else? Or does the user have to do that every time?
FSeed's user avatar
  • 105
4 votes
0 answers
447 views

How is Pauli twirling applied to a noisy gate in practice?

My understanding of Pauli Twirling mainly comes from this paper. Please, correct me if I am wrong in any part of my explanation. General idea of Pauli twirling The idea of Pauli Twirling is the ...
Marco Fellous-Asiani's user avatar
4 votes
0 answers
113 views

Are there any systematic tools for estimating expected error rate?

Like we all probably know, today’s NISQ computers are, as their name implies - very noisy. Hence, if we desire to obtain valuable results then we should come up with circuit designs that minimizes the ...
Ohad's user avatar
  • 1,759
4 votes
0 answers
331 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 ...
user8961's user avatar
3 votes
2 answers
676 views

How to implement gate error mitigation in Qiskit?

I have been using the Ignis module for performing error mitigation but it accounts only for the measurement errors. For this reason, I want to know if there is some way to perform gate error ...
Camilo160's user avatar
  • 284
3 votes
2 answers
363 views

How to transform a qiskit quantum circuit to a braket circuit?

I have a quantum circuit in qiskit. Now I want to know is there any way that I can transform it to a braket circuit in AWS? I want to use error mitigation in AWS. I have the circuit in qiskit. But as ...
INDRANIL MAITI's user avatar
3 votes
1 answer
382 views

Erasure errors in quantum error correction

Consider an $[n, k, d]$ classical code. This code can correct up to $d-1$ erasures. For example, if we have the code that maps $0\rightarrow 00$ and $1\rightarrow 11$, this code has distance $2$. ...
user1936752's user avatar
  • 3,075
3 votes
1 answer
118 views

IBM Melbourne quantum computer performance and errors

What is the reason for high variation in measurement probability results of a simple 3/4 qubit measurement circuit on IBM Melbourne machine in comparison with the same circuit being run on IBM Vigo/...
parth's user avatar
  • 305
3 votes
1 answer
218 views

How to use Clifford Data Regression for the MaxCut Problem

i read about Clifford Data Regression in https://arxiv.org/pdf/2005.10189.pdf. If I have understood this correctly, then one receives the mitigated expected value of an observable from CDR. For the ...
qrafix's user avatar
  • 53
3 votes
1 answer
146 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 ...
Camilo160's user avatar
  • 284
3 votes
1 answer
139 views

What do coupling coefficients mean in terms of Pauli gates, and why are they time dependent?

I am reading this error mitigation paper by the IBM team and I am slightly confused about the meaning of "coupling coefficients" when describing multi-qubit Hamiltonian. I have only seen ...
Eesh Starryn's user avatar
3 votes
1 answer
422 views

Readout Error in Qiskit: What is a reasonable model?

The Readout Error in Qiskit is described here: https://qiskit.org/documentation/stubs/qiskit.providers.aer.noise.ReadoutError.html Although it is easy to obtain such an error for 1-qubit for IBMs ...
Marion's user avatar
  • 635
2 votes
2 answers
142 views

Error mitigation matrix as backend property: Are any "reliable" mitigation matrices publicly available?

Given that the error mitigation matrix (meas_fitter.filter) does not vary so much for a given backend and number of qubits, then what are the advantages and disadvantages in the determination of the ...
Camilo160's user avatar
  • 284
2 votes
1 answer
658 views

Best tutorial about the variational quantum eigensolver (VQE)

I want to find a tutorial on VQE with a good valance between the theoretical background of the method, and it's working implementation on QPU. Covering advanced topics such as quantum error ...
user3116936's user avatar
2 votes
3 answers
270 views

Surface Code - Convert Control Error to Clifford Error

I am simulating surface code, in order to find the logical error as a function of control error in my circuit. Each of my data qubits is multiplied in control error = a unitary matrix $U$ which is ...
Ron Cohen's user avatar
  • 1,482
2 votes
1 answer
106 views

Randomness using simple parallel Hadamard circuit

I've recently tried to build a Random generator using 5 hadamard gates (shown as U2 below) measured to 5 classical bits in parallel as shown in the circuit image. I've executed this circuit for 8192 ...
Konrad's user avatar
  • 23
2 votes
1 answer
239 views

Implementing Readout Error in my circuit seems to have no effect whatsoever

I am trying to perform a simulation using Qasm in order to see how the readout error actually affects my circuit. The circuit I am implementing is a trivial one, the three qubit one that implements ...
Marion's user avatar
  • 635
2 votes
2 answers
549 views

How to calculate the number of qubits in surface code, for given physical error rate

I am working on improvement of physical qubit error probability. I would like to know: how to calculate the size I need for surface code, given that I need that the logical error probability will be ...
Ron Cohen's user avatar
  • 1,482
2 votes
1 answer
337 views

Is there a faster way to do real-time error mitigation in qiskit?

I'm working on the readout error mitigation on a set of results obtained from different quantum circuits. The method I want to apply is to generate the confusion matrix for each quantum circuit (as ...
ZR-'s user avatar
  • 2,398
2 votes
1 answer
454 views

How to do error mitigation on the ibmq_16_melbourne?

I'm trying to make a calibration matrix using CompleteMeasFitter as in here on IBMQ Melbourne, but I need to use all 15 qubits, which mean it has to run 32768 calibration circuit, far exceeding the 75 ...
Jack Nathan's user avatar
2 votes
1 answer
152 views

Specifying qubits to achieve measurement error mitigation on Qiskit

I'm learning how to do error mitigation on Qiskit as my experiment result differs from the simulated result. I read the tutorial here, but I have some questions about it. If I have understood it ...
Frank Wang's user avatar
2 votes
2 answers
652 views

Mitigating the noise in a quantum circuit

I'm using Qiskit and I have a Quantum Circuit (say, circuit) that gives reasonable results when using the simulator, namely ...
Vitality's user avatar
  • 143
2 votes
1 answer
83 views

Bounds on success probability of an algorithm under depolarizing noise

The problem I have is that, I have a quantum circuit performing a certain task (e.g. Shor's algorithm) and the circuit is subject to depolarizing noise, Pauli errors, after each gate. And I want to ...
AndyLiuin's user avatar
  • 376
2 votes
1 answer
67 views

Which error channel definitions should I use if I want to compare the performance of a QEC protocol for depolarizing errors vs dephasing errors?

Let's say you want to investigate if a quantum error correction or error mitigation protocol performs better under dephasing errors compared to depolarizing errors, or if a quantum algorithm is more ...
Turbotanten's user avatar
2 votes
1 answer
122 views

Options for more complex error models on stim?

We're trying to simulate whether some initialization strings are preferable to others. For example, would initializing all qubits to $|0\rangle$ lead to a lower error rate? Is it possible to further ...
xilinzhou's user avatar
2 votes
2 answers
187 views

Surface Code Eigenstates as Circles

I learned that logical $|0\rangle$ of surface code, is an eigenstate, where all stabilizers are +1 value, and since the z-stabilizer is enforcing an even amount of edged in each node, and the x-stab ...
Ron Cohen's user avatar
  • 1,482
2 votes
1 answer
81 views

Quantum Error Correction Difficulties: "Measurements destroy quantum information" Intuition

Context: In section 10.1.1, Nielsen and Chuang describe the difficulties QEC faces compared to classical error correction. Particularly that Measurements destroy quantum information. Shor states in ...
vollautomatthi's user avatar
2 votes
1 answer
74 views

Is there something like error-suppression codes?

My question is a bit on the soft side, and basically asks if there is something between error mitigation and full error correction? On the one hand, as far as I understand, trying to increase the ...
Nikita Nemkov's user avatar
2 votes
1 answer
607 views

What is the concrete difference between qiskit thermal_relaxation_error and phase_amplitude_damping_error?

What is the concrete difference between those two error models in qiskit.providers.aer.noise? For phase_amplitude_damping_error ...
qcabepsilon's user avatar
2 votes
1 answer
63 views

Can ancilla-based parity measurements be used to detect errors in NISQ algorithms?

Measuring stabilizer eigenvalues is a fundamental part of quantum error correction. However, I was wondering if the idea of measuring a stabilizer using an ancilla could be useful in other contexts as ...
Lior's user avatar
  • 1,220
2 votes
1 answer
44 views

Qubit State (theta,phi) Dependence on the Readout Error

Do the readout errors on the publicly available IBM quantum computers have any dependency on the state being measured? That is, if we are measuring a qubit in the state $\cos({\theta/2}) |0> + e^{i\...
user206444's user avatar
2 votes
1 answer
221 views

Confusion about Mitiq folding for zero noise extrapolation

I'm reading the mitiq zero noise extrapolation documentation and I just can't make sense of how the scale_factor for folding work. "The minimum scale factor is one (which corresponds to folding ...
Ahmed Malik's user avatar
2 votes
1 answer
132 views

About qiskit's error mitigation

In qiskit, the error correction using least squares is apparently in qiskit-ignis/qiskit/ignis/mitigation/measurement/filters.py, source code from github and reads: ...
user2820579's user avatar
2 votes
0 answers
34 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 ...
Srini Thirumalai's user avatar
2 votes
0 answers
58 views

Crosstalk error of simultaneous cnots

We can use simultaneous randomized benchmarking (SRB) to quantify the crosstalk impact of simultaneous CNOTs. The crosstalk error is caused by many reasons, for example, the always-on ZZ interaction, ...
peachnuts's user avatar
  • 1,393
2 votes
0 answers
52 views

Tensored vs ordinary measurement mitigation runtime

My experiments show that the runtime of actually applying the measurement filter matrices to circuit execution results is much slower for tensored mitigation than ordinary mitigation. Tensored ...
FSeed's user avatar
  • 105
1 vote
2 answers
59 views

Is it possible to use the mitigation process on a teleportation circuit?

Is it possible to use the mitigation process on a teleportation circuit? Sorry, i'm still starting, if someone can get me out of this doubt, I would appreciate it. The circuit I'm trying to make this ...
Ikky R's user avatar
  • 79