  Quantum error correction (QEC) plays a crucial role in correcting noise and
paving the way for fault-tolerant quantum computing. This field has seen
significant advancements, with new quantum error correction codes emerging
regularly to address errors effectively. Among these, topological codes,
particularly surface codes, stand out for their low error thresholds and
feasibility for implementation in large-scale quantum computers. However, these
codes are restricted to encoding a single qubit. Lattice surgery is crucial for
enabling interactions among multiple encoded qubits or between the lattices of
a surface code, ensuring that its sophisticated error-correcting features are
maintained without significantly increasing the operational overhead. Lattice
surgery is pivotal for scaling QECCs across more extensive quantum systems.
Despite its critical importance, comprehending lattice surgery is challenging
due to its inherent complexity, demanding a deep understanding of intricate
quantum physics and mathematical concepts. This paper endeavors to demystify
lattice surgery, making it accessible to those without a profound background in
quantum physics or mathematics. This work explores surface codes, introduces
the basics of lattice surgery, and demonstrates its application in building
quantum gates and emulating multi-qubit circuits.
