Heat Currents Build Nanoscale Circuits Mirroring Electronic Logic Gates

Shuvadip Ghosh from the Indian Institute of Technology Kanpur and colleagues have developed a new method for quantum computation using quantum thermal logic gates. A direct parallel exists between these gates and their classical electronic counterparts, utilizing heat current within a coupled quantum-dot system connected to metallic thermal reservoirs to perform logic operations. The work details a feasible nano-electronic quantum circuit architecture and marks a key step towards building quantum circuits based on thermal effects rather than traditional electrical signals. A key energy scale of 37 μeV now defines the operational threshold for these quantum thermal logic gates, representing a substantial improvement over previous methods. Historically, constructing…