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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.

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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
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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
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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
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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
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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
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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
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
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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
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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
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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
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What is the relation between Shor's code and the GHZ states?

The logical states for Shor's code $|0_L\rangle$ and $|1_L\rangle$ are $$ \begin{equation} \begin{aligned} |0_L\rangle = \left(\frac{|000\rangle+|111\rangle}{\sqrt{2}}\right)^{\otimes{}3}\...
vollautomatthi's user avatar
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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?
Leandro Matheus Morais da Silv's user avatar
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What kind of quantum error is most likely to happen and are considered most in quantum error correction codes?

In quantum error correction literature, it is assumed that the possibility of happening a few-qubit error is bigger than a many-qubit error. Does this assumption have any physical evidence? I am ...
qdmj's user avatar
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ZNE for mitigating errors in probability distribution results

Can ZNE be applied to mitigate errors for getting the probability distribution in the computational basis rather than mitigating errors for calculation of expectation values?
Amey Meher's user avatar
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How does error accumulate when entangling two distant qubits with limited connectivity?

My goal is to minimize accumulated error when entangling two qubits that cannot be entangled via a single native two qubit gate operation. I have a coupling map/graph for the qubits of an IBM quantum ...
ty.'s user avatar
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Qiskit's measurement error mitigation from counts data only, in 2023

Months or years ago, in a remote part of the globe, someone accessed an IBM Quantum computer online to perform a real experiment. She saved the resulting measurement outcomes of the algorithm in csv ...
PDRX's user avatar
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Zero noise extrapolation for error mitigation: Meaning of rescaled density matrix, specifically when there is no local hamiltonian evolution

I have a few questions regarding dynamics rescaling for zero noise extrapolation. In the paper Error mitigation for short-depth quantum circuits, in equation (30), they write We redefine $T \...
lost forgotten pearl's user avatar
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how does one get native 2-body measurements?

How are Majorana-based architectures able to possess native 2-body measurement operations? Could anyone provide an appropriate reference explaining that? Are those native measurement operations ...
user111's user avatar
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Time Complexity (Big O Notation)

What is the time complexity of the two error-mitigation methods that are implemented in qiskit.ignis. 1- pseudo inverse. 2- least squares.
rabah hacene benaissa's user avatar
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How to measure the error rate (or fidelity) of a particular gate (such a H, T) by Qiskit

We know the calibration data of IBM's quantum devices can be retrieved through the randomized benchmarking method, which is included in Qiskit. However, the calibaration data about gates just gives ...
jojo's user avatar
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Why measurement error mitigation does not seem to improve the result of VQE?

I try to follow this to perform measurement error mitigation for calculating H2 energy with VQE. With some modification, I did the calculation on "qasm_simulator" with the noise model built ...
fagd's user avatar
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There seems to be a bias against states with more 1s, in IBM's calibration matrix generator: What are the consequences and possible solutions?

Qiskit's function CompleteMeasFitter builds a calibration matrix in this way (2 qubit case): Everything is initialized in the state $|00\rangle$, which is the ...
user1271772 No more free time's user avatar
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Which algorithms use amplitude of the measurement of a cricuit?

So my question is motivated by noise. If we have a circuit and we get multiple results. In which algorithms does it matter to use which amplitude the results have? For example, when we measure our ...
Qubii's user avatar
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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 ...
AndyLiuin's user avatar
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Does anybody know what a low-degree Markov field is?

In the paper Fast Estimation of Sparse Quantum Noise I saw the following description: quantum devices approaching the fault-tolerant regime will have very few significant errors (and therefore are ...
karry's user avatar
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Code Length of most Naive Repetition Code

What is the formula or answer to the following coding: I would like to get logical qubit with logical error rate of $P_L=1E-10$ or $P_L=1E-19$ for Shor's algorithm, but I would like to know how many ...
Ron Cohen's user avatar
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New Packages for complete_meas_cal and CompleteMeasFitter

I'm reading a code that uses the functions complete_meas_cal, CompleteMeasFitter to implement error mitigation (in Qiskit). However, these two functions are deprecated, and I couldn't find the updated ...
Yili's user avatar
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