  Building large-scale quantum computers from smaller modules offers a solution
to many formidable scientific and engineering challenges. Nevertheless,
engineering high-fidelity interconnects between modules remains challenging. In
recent years, quantum state transfer (QST) has provided a way to establish
entanglement between two separately packaged quantum devices. However, QST is
not a unitary gate, thus cannot be directly inserted into a quantum circuit,
which is widely used in recent quantum computation studies. Here we report a
demonstration of a direct CNOT gate realized by the cross resonance (CR) effect
between two remotely packaged quantum devices connected by a microwave cable.
We achieve a CNOT gate with fidelity as high as $99.15 \pm 0.02\%$. The quality
of the CNOT gate is verified by cross-entropy benchmarking (XEB) and further
confirmed by demonstrating Bell-inequality violation. This work provides a new
method to realize remote two-qubit gates. Our method can be used not only to
achieve distributed quantum computing but also to enrich the topology of
superconducting quantum chips with jumper lines connecting distant qubits. This
advancement gives superconducting qubits broader application prospects in the
fields of quantum computing and quantum simulation.
