---
title: FermionicMode (latest version)
description: API reference for qiskit_fermions.circuit.FermionicMode in the latest version of qiskit-fermions
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-fermions/circuit-fermionic-mode
---

# FermionicMode

Type: [`TypeAlias`](https://docs.python.org/3/library/typing.html#typing.TypeAlias)

Default value: `<class 'qiskit.circuit.Qubit'>`

A type alias of [`Qubit`](/docs/api/qiskit/circuit#qiskit.circuit.Qubit).

Although this does not really give us any functional guarantees, it serves to better document the API contract that instances of this type are interpreted as fermionic modes.