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40 physical cats

Backend name : EMU:40Q:PHYSICAL_CATS

Backend type : Emulator, physical

About this backend

EMU:40Q:PHYSICAL_CATS reproduces the behavior of a chip featuring 40 cat qubits connected in a grid pattern.

It only supports bias-preserving gates (see Supported instructions).

It can be used to implement a long error correction code, or logical operations between several logical qubits using a shorter code.

This backend is configured to have the same properties as the qubits used in the paper High-performance repetition cat code using fast noisy operations [Le Régent et al., 2022].

⚠️ Although this backend makes it possible to choose from 40 different qubits, using it to run circuits using more than ~10-15 qubits will likely be slow or fail altogether. The exact limit depends on the capabilities of your machine.

Supported backend parameters

  • average_nb_photons
    • Supported values: 4 and above
  • kappa_1
    • Supported values: 10 and above
  • kappa_2
    • Supported values: 100 and above

💡 The kappa_1 / kappa_2 ratio must be between 1e-7 and 1e-1

Read more about backend parameters here

Supported gates

  • delay
  • initialize(value, 0)
    • value can only be one of the following: 0, 1, + or -
  • z(0)
  • x(0)
  • rz(0)
  • cx(control_index, target_index)
  • measure(0, clbit_index)
  • measure_x(0, clbit_index)

Read more about supported gates here.

Supported providers

  • ✅ AliceBobLocalProvider
  • ✅ AliceBobRemoteProvider

Connectivity

6-physical-qubits coupling map

Expected performance

This backend features an error model based on theoretical papers. It is not meant to accurately reproduce a specific current or future Alice & Bob chip.

The formulas and references we used are documented in the source code at https://github.com/Alice-Bob-SW/qiskit-alice-bob-provider/blob/main/qiskit_alice_bob_provider/processor/physical_cat.py

Availability schedule

As an emulator, this backend is expected to be available 24/7.

Live status for backends is available at https://api-gcp.alice-bob.com/console/status.