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OpenQASM Working Groups

As outlined in the OpenQASM governance document, the Technical Steering Committee (TSC) will, from time to time, elect to create Working Groups (WG) to study issues. The TSC will appoint a Contributor as Chair for each WG. A WG shall submit a language RFC or pull request to the OpenQASM specification for review by the TSC at an agreed upon date. A WG will be automatically disbanded upon acceptance or (final) rejection of the RFC/pull request.

Current Working Groups

Generics and circuit families

Objective: Recommend what range of generics / parameterised circuit family functionality (beyond angle parameters) would be suitable for inclusion in OpenQASM, and what syntax should be used for it.

Chair: Niel de Beaudrap
Members: Colm Ryan, Andrew Cross, Ali Javadi, Blake Johnson, Matthew Amy

Profiles & Releases

Objectives: Define a minimum set of features for hardware implementors (base profile) and build the infrastructure for specifying profiles and release versions.

Description: One of the core tenets of OpenQASM 3.0 is versatility, and in particular the idea that not all hardware and tooling needs to support all OpenQASM 3.0 features. A hardware implementor can assume that certain aspects of compilation are dealt with at a higher-level, and can focus their implementation on only core features of the language.

This working group will group various aspects of the language into "featuresets", and then create profiles which are a collection of those featuresets. Throughout this process they will also review all the featuresets of OpenQASM 3.0 and define a release version of the spec, plus its associated Github infrastructure.

This WG will draw inspiration from a complementary effort in the QIR project: https://github.com/qir-alliance/.github/blob/main/workstreams/Base_Profile_Workstream.md

Questions:

  • Are there additional profiles which would be useful beyond the base profile? For instance, maybe an OpenQASM 2.0 profile that would certify a tool is backwards compatible.

Completion of WG This working group will have completed its efforts when:

  • All features have been defined and grouped into featuresets
  • At least one profile has been defined
  • The release version of OpenQASM 3.0, and associated infrastructure, is merged

Chair: Michael Healy (IBM Quantum) Members: Ali Javadi, Bettina Heim, Blake Johnson, Dor Israeli, Jeff Heckey, Jon Best, Lev Bishop, Luciano Bello, Niel de Beaudrap, Philipp Schindler, Steven Heidel, Thomas Alexander, Yunong Shi

Past Working Groups

OpenPulse

Objective: Define a pulse grammar "openpulse" to be used for microcoding of gate instructions with OpenQASM defcal's.

Chair: Thomas Alexander (IBM Quantum)
Members: Blake Johnson, Colm Ryan, Derek Bolt, Peter Karalekas, Lauren Capelluto, Michael Healy, Prasahnt Sivarajah, Yunong Shi, Steven Heidel

Types and casting

Objective: Define type hierarchy and implicit casting rules. Questions:

  • Any implicit casts?
  • What explicit casts are allowed?
  • Registers vs arrays?
  • Can you index into integers and get bit value?
  • Is an int equivalent to an array of bits?

Chair: Michael Healy (IBM Quantum) Members: Niel de Beaudrap, Hiroshi Horii, Blake Johnson, Colm Ryan, Luciano Bello, Prasahnt Sivarajah, Yunong Shi, Jake Lishman, Bettina Heim

Dynamic Dereference & Allocation

Objectives: Formulate response to issues raised by Physical mapping of dynamically dereferenced qubits #307

  • Provide concrete examples proving this cannot be dealt with in OpenQASM 3 as the spec stands
  • If in scope, provide rough solutions.
  • Keep in mind the difference between dynamic dereference and dynamic allocation.
  • Capture implicit assumptions that would make it hard to introduce this in future.

Questions:

  • Do dynamically dereferenced qubits break hidden assumptions in the current spec?
    • Gates may have different implementations for each dynamic qubit
    • Multiple qubit gates require connectivity or swaps
    • Index out of bounds in runtime?

Chair: Dor Israeli (Quantum Machines) Members: Thomas Alexander (IBM Quantum), Niel de Beaudrap (Sussex), Philipp Schindler (Innsbruck), Bettina Heim (Microsoft)

Group was merged into part of the profiles and releases working group.

Pragmas

Objectives: Define a pragma syntax, standard directives, the standard behavioral expectations for interacting within a toolchain. Questions:

  • What should be the pragma syntax? Should there be more directives (e.g., #if, #define), or should the functionality avoid anything like a pre-processor?
  • What should be supported in the language instead of as a pragma?
  • What is not supported by pragmas
  • Conventions:
    • How should multiple OpenQASM tools interact with pragmas?
    • How do pragmas that may operate at different levels of the MLIR different stages of processing determine when and where to be processed?
    • Syntactical conventions for independent developers

Chair: Jeff Heckey (AWS)
Members: Ali Javadi (IBM Quantum) BẢO Bach Gia (Ho Chi Minh University of Technology), Jake Lishman (IBM Quantum), Jack Woehr (IBM Quantum), Lev S. Bishop (IBM Quantum), Michael Healy (IBM Quantum), Thomas Alexander (IBM Quantum), Yunong Shi (AWS)