MIT: New quantum computing architecture could be used to connect large-scale devices

Good news! Possibly a breakthrough! Down to the precise control of a single photon and its direction!

"... researchers have developed a quantum computing architecture that will enable extensible, high-fidelity communication between superconducting quantum processors. ...
One challenge in building a large-scale quantum computer is that researchers must find an effective way to interconnect quantum information nodes — smaller-scale processing nodes separated across a computer chip. Because quantum computers are fundamentally different from classical computers, conventional techniques used to communicate electronic information do not directly translate to quantum devices. ..."

From the abstract:

"Routing quantum information between non-local computational nodes is a foundation for extensible networks of quantum processors. Quantum information transfer between arbitrary nodes is generally mediated either by photons that propagate between them or by resonantly coupling nearby nodes. The utility is determined by the type of emitter, propagation channel and receiver. Conventional approaches involving propagating microwave photons have limited fidelity due to photon loss and are often unidirectional, whereas architectures that use direct resonant coupling are bidirectional in principle but can generally accommodate only a few local nodes. Here we demonstrate high-fidelity, on-demand, directional, microwave photon emission. We do this using an artificial molecule comprising two superconducting qubits strongly coupled to a bidirectional waveguide, effectively creating a chiral microwave waveguide. Quantum interference between the photon emission pathways from the molecule generates single photons that selectively propagate in a chosen direction. This circuit will also be capable of photon absorption, making it suitable for building interconnects within extensible quantum networks."

New quantum computing architecture could be used to connect large-scale devices | MIT News | Massachusetts Institute of Technology Researchers have demonstrated directional photon emission, the first step toward extensible quantum interconnects.

On-demand directional microwave photon emission using waveguide quantum electrodynamics (no public access)

Credits: Synced Global AI Weekly