goldsmdn/steanecode

MSc Steane Code project

• 👋 Hi, I’m @goldsmdn
• 👀 I’m interested in Quantum Computing, particulary Quanutm Error Correction, and write Python games for fun.
• 🌱 I work at Digital Catapult and have an MSc in Quantum Technology at UCL
• 💞️ I’m looking to collaborate on quantum computing projects
• 📫 You can reach me on [email protected]

steanecode's Issues

Remove deadcode

Tidy up and remove deadcode.

Documentation issues

1. Correct spelling in documentation index
2. Give more information in the overview

Change definition of validity

In function process_FT_results add a new parameter post_select and if this is True only count codewords as not valid if outside the range.

Include get_noise in helper functions

1. Add function module in helper functions
2. Change worksheets

Tidy up docutexts

Add more texts to circuits.py

Add mean and standard deviation to worksheets

1. Change single qubit worksheet to add mean and standard deviation
2. Add new helper function to calculate mean of a list
3. Add new test of helper function

Testing improvement

Improve accuracy of testing by checking results specifically against desired state "0000000".

Add new function to reset one qubit to enable new encoding scheme.

Add new function to reset one qubit. Set up new workbook to test scheme.

Change worksheet to include scheme D in comparison. Needed to change helper functions.

Add new class for Bacon Shor code

• add new class to circuits.py
• update Bacon Shor worksheet

Code refactoring

Need to refactor code to remove variables like self.__data_0 by creating a list.

Minor change to circuits.py documentation

Add _ to variable names in force_errors code

Code refactoring

Need to refactor code to remove variables like self.__data_0 by creating a list.

Add ancilla to Bacon Shor circuits

Change circuits.

Need fault tolerant ancilla

Code fault tolerant ancilla.

Documentation updates

Need:

• new documentation for helper functions module
• update documentation in test functions module for new tests
• change documentation in circuits module for changes to module
• regenerate documentation

Change title of documentation

Remove reference to MSc on conf.py

Final workbook versions

Place final versions of workbooks into GitHub after checking.

Add mean to graph in the basic single qubit worksheet.

• graph updated.

Need to delete graphs and figures

Need to reorganise to delete graphs and figures.

Jupyter Notebook

Tidy up Jupyter Notebook to remove reference to pipe cleaning

Allow ability to measure FT logical encoding repetively

Change documentation overview

The documentation overview needs to be updated to reference the Bacon Shor class.

Add further worksheets

-Steane_code_decoding_no_noise

• Basic single qubit errors transpilation
• Steane code decoding with noise
• Steane code error detection with noise
• Steane_Code_error_detection_no_noise
• Steane code logical operations with noise and without transpilation

Baseline release for noise model tests

• Improve documentation for baseline cases
• Include graphs
• Delete superseded workbooks

Need new test for error correction by code

Add new test to test_circuits.py

Add new functions to return parity matrix and codewords.

Add to helper functions.

Modify helper functions

Change helper functions to:

• add look up data
• modify summarise_logical_counts to use a list of values
• add convert codewords to change to a list of lists to a list of strings

Baseline - Single qubit and two qubit errors

Python code changes

• Need a new module for helper functions
• Need to change circuits.py to allow two options for error correction
• Modify and add extra tests.

Refactor correct_errors for issue found whilst documenting code

Make code more readible when handling case of two parity row matrices.

Updates to documentation

Need to update the documentation to include:

• overview
• documentation explanation
• notebook explanation

Also include the baseline workbook

Change titles for workbooks for FT scheme B and C

Change titles

Need a diagram of the Steane code in the overview

Add a diagram of the Steane code to the overview.

Need to be able to suppress ancilla rows

Change define registers to only set up registers needed.

Upversion Steane Code master worksheet

1. Reformat diagram
2. Add initialisation at start of process. This happens anyway but is added for clarity.
3. Tidy up and recheck parameter settings.

Measurement for data qubit is not correct with FT ancilla

Change diagram in documentation

Existing diagram uses red and green, so it not suitable for some readers with color blindness.

Basic tests on a single qubit error

We need a test to verify that the impact on a single qubit is as predicted by the error model.

Change encoding circuit to give an option to reduce by one the number of CX gates

Paetznick and Reichardt [1] suggest a method of reducing the CX gates in the encoding circuit by one. Change the code to allow this to be implemented.

[1] Paetznick A, Reichardt BW. Fault-tolerant ancilla preparation and noise threshold lower bounds for the 23-qubit Golay code. Quantum Inf Comput [Internet]. 2011 Jun 11 [cited 2021 Jul 17];12(11–12):1034–80. Available from: https://arxiv.org/abs/1106.2190v2

Remediate count_valid_output_strings

• allow post selection
• refactor code to be more logical

Refactor code to modularise standing data and register set up

Make new function modules to:

• define the standing data
• define the quantum registers

Add new output text to process_FT_results

Also, need to change logic for processing FT ancilla after testing.

Update to single qubit gates workbooks

1. Update documentation for single qubit gate workbook
2. Include Egan single qubit gate
3. Update Readme

Change code so that the parity matrix is a list of strings

1. Change from list of lists to list of strings

Enhance testing framework

1. Test validation that can't run error correction with two logical qubits
2. Test validation that logical qubit index is in bounds
3. Test validation that physical qubit index is in bounds

Fix bug in summarise logical counts

No key error returned.

Code tidy up

Shorten code so less than 80 charactors per line if possible.

Correct capitalisation in Workbook titles

Some have Steane code, not Steane Code.

Initialise ancilla

Initialise ancilla