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Question 1

3votes

3answers

297views

Base codes with transversal non-Clifford - why not?

A leading approach to circumventing the Eastin-Knill theorem involves using stabilizer codes which support a transversal implementation of the full Clifford group, and obtaining universal gateset via ...

Curious_non_expert

31

askedNov 24 at 10:47

Question 2

2votes

1answer

137views

stim : confusion about the use of observables

The role of adding observables is not clear to me. Here are some points of confusion :(1)From the circuit I generate a detector error model using dem from which I generate twomatrices (pcm and lcm) ...

unknown

2,994

askedNov 19 at 15:27

Question 3

1vote

0answers

49views

In Google Stim, is there a separate algorithm for handling measurement errors that occur before the final round?

Based on the paper “Sparse Blossom: Correcting a Million Errors per Core Second with Minimum-Weight Matching,” my understanding is that the MWPM decoder performs minimum-weight matching between the ...

Jayb

15

askedNov 12 at 6:59

Question 4

1vote

1answer

73views

Stabilizer flow details when using detslice figures

I only have a rough idea that this is a back propagations of the pauli flow. But some details really confuse me.What's the difference between the filled and hollow circles. For example, tick 96 we a ...

Zeen Sun

31

askedNov 9 at 16:52

Question 5

0votes

1answer

49views

Asymptotic scaling of surface codes, why p and not 2p/3?

In Fowler's paper, "Surface codes: Towards practical large-scale quantum computation" (link), a rudimentary probabilistic model for logical errors is described. My only issue with this is ...

Arya K

41

askedNov 9 at 15:10

Question 6

0votes

1answer

49views

Is there a way to know the propagated errors at a certain place of a circuit in Stim?

What I want to realize in Stim is:Given a circuit, errors are sampled. Then, at a certain place of a circuit (e.g., qubit 6 after a certain CNOT gate), I want to know the errors there if we propagate ...

lan

301

askedNov 8 at 7:25

Question 7

0votes

1answer

110views

stim: understanding DEM probability calculations

I'm trying to understand how the probabilities in a stim DEM are calculated.I tried three simple cases; I understand the first, but can't seem to go beyond that :case 1: I understand the ...

unknown

2,994

askedNov 6 at 14:40

Question 8

0votes

1answer

68views

How to Implement Y Flows in Lattice Surgery CX?

I am currently trying to implement the Y-Flows for the Lattice Surgery CX and having trouble understanding what MPP measurements I need for what logical flows and how I might realize them....

Fabian Spreemann

324

askedNov 1 at 12:26

Question 9

1vote

1answer

67views

How does the surface code protect against correlated errors acting on two logical qubits?

In the surface code, each logical qubit is typically encoded in a separate patch of physical qubits. The code can correct up to ⌊(d − 1)/2⌋ errors on a single logical qubit patch, where d is the code ...

Edmond

11

askedOct 31 at 10:09

Question 10

0votes

1answer

53views

Quantum Phase Estimation

Implement the Quantum Phase Estimation (QPE) algorithm using the unitary operator S and the eigenstate∣1⟩ as the target qubit. Use 3 counting qubits and 1 target qubit.Assumptions / notation:Assume ...

Anitya Gupta

11

askedOct 30 at 11:00

Question 11

1vote

0answers

79views

Preparing a logical state of a stabilizer code in qiskit

I'm using qiskit to study some aspects of a simple error correcting (stabilizer) code. I have a code which works for particular simple examples, but I am struggling to generalize the preparation of ...

miggle

173

askedOct 28 at 12:46

Question 12

3votes

3answers

191views

Why do we only need to correct for diagonal Pauli errors (X, Z)?

Why do we only need to account for Pauli X and Z errors for full QEC?The basis of quantum error correction is that we only need to correct for X and Z errors. We can choose Paulis as a basis set for ...

GreenPhi

85

askedOct 28 at 9:02

Question 13

1vote

1answer

171views

Propagation of Clifford in `stim`

From what I understand, errors are simulated instim using Pauli frames representing Pauli errors that propagate through the circuit (without signs). That way, we ...

Do a Phase Flip

712

askedOct 27 at 18:03

Question 14

1vote

0answers

25views

Transforming from non-additive to stabilizer code

Is there a way to code-switch from non-additive codes to stabilizer codes, such as surface codes?If so, is it always possible or is it only possible in certain cases?

PrimeSoup

33

askedOct 27 at 14:14

Question 15

0votes

1answer

63views

Unable to generate parity check matrices with generator matrices for CSS-T Code

In this paper, the authors provide a method for constructing qLDPC CSS-T codes. They provide example generator matrices for the binary linear codes $C_1$ and $C_2$ such that $Q(C_1, C_2)$ is a CSS-T ...

Mark A

321

askedOct 26 at 7:04

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Questions tagged [error-correction]

Base codes with transversal non-Clifford - why not?

stim : confusion about the use of observables

In Google Stim, is there a separate algorithm for handling measurement errors that occur before the final round?

Stabilizer flow details when using detslice figures

Asymptotic scaling of surface codes, why p and not 2p/3?

Is there a way to know the propagated errors at a certain place of a circuit in Stim?

stim: understanding DEM probability calculations

How to Implement Y Flows in Lattice Surgery CX?

How does the surface code protect against correlated errors acting on two logical qubits?

Quantum Phase Estimation

Preparing a logical state of a stabilizer code in qiskit

Why do we only need to correct for diagonal Pauli errors (X, Z)?

Propagation of Clifford in `stim`

Transforming from non-additive to stabilizer code

Unable to generate parity check matrices with generator matrices for CSS-T Code

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