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2025-T1: Performance improvements for large circuits

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Last updated Jun 25, 2025
40% complete

Cirq gets slow for circuits of ~100 qubits. Users have raised concerns about memory needs and ability to handle circuits of 500 or 1000 qubits.

We still need to clarify:

  • What use cases are already slow at 100 qubit size?
  • When do we need the capability to handle circuits of 500 and 1000 qubits?
  • What functions and use cases need to be covered for circuits of that size?

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