An apparatus comprising: a chip; a classical computing processor formed on the chip; a quantum computing processor formed on the chip; the chip being a single chip such that the classical computing processor and quantum computing processor are implemented using the single chip; and one or more inductive coupling components between the classical computing processor and the quantum computing processor, the one or more inductive coupling components being formed on the chip and being configured to allow data exchange between the classical computing processor and the quantum computing processor; wherein the classical computing processor comprises a plurality of classical unit cells, each classical unit cell comprising a plurality of active components configured to generate a respective classical bit, wherein for each classical unit cell, a first subset of the plurality of active components is coupled to a second subset of the plurality of active components; wherein the quantum computing processor comprises a plurality of quantum unit cells comprising a respective plurality of qubits wherein for each quantum unit cell, a first subset of the plurality of qubits is coupled to a second subset of the plurality of qubits; wherein, for each classical unit cell, the first subset of the plurality of active components is coupled, by the one or more inductive coupling components, to the first subset of qubits within a corresponding quantum unit cell; wherein: the first subset of the plurality of qubits provides an input to, and an output from, the quantum computing processor, wherein those qubits which provide the input do not provide the output; an output of the classical computing processor is coupled to the input of the quantum computing processor; the output of the quantum computing processor is coupled to an input of the classical computing processor; and the second subset of the plurality of qubits is not coupled to the classical computing processor. a chip; a classical computing processor formed on the chip; a quantum computing processor formed on the chip; the chip being a single chip such that the classical computing processor and quantum computing processor are implemented using the single chip; and one or more inductive coupling components between the classical computing processor and the quantum computing processor, the one or more inductive coupling components being formed on the chip and being configured to allow data exchange between the classical computing processor and the quantum computing processor; wherein the classical computing processor comprises a plurality of classical unit cells, each classical unit cell comprising a plurality of active components configured to generate a respective classical bit, wherein for each classical unit cell, a first subset of the plurality of active components is coupled to a second subset of the plurality of active components; wherein the quantum computing processor comprises a plurality of quantum unit cells comprising a respective plurality of qubits wherein for each quantum unit cell, a first subset of the plurality of qubits is coupled to a second subset of the plurality of qubits; wherein, for each classical unit cell, the first subset of the plurality of active components is coupled, by the one or more inductive coupling components, to the first subset of qubits within a corresponding quantum unit cell; wherein: the first subset of the plurality of qubits provides an input to, and an output from, the quantum computing processor, wherein those qubits which provide the input do not provide the output; an output of the classical computing processor is coupled to the input of the quantum computing processor; the output of the quantum computing processor is coupled to an input of the classical computing processor; and the second subset of the plurality of qubits is not coupled to the classical computing processor. the first subset of the plurality of qubits provides an input to, and an output from, the quantum computing processor, wherein those qubits which provide the input do not provide the output; an output of the classical computing processor is coupled to the input of the quantum computing processor; the output of the quantum computing processor is coupled to an input of the classical computing processor; and the second subset of the plurality of qubits is not coupled to the classical computing processor.