Record-scale entanglement of quantum fields for measurement-based quantum computing

Achieving scalability and eschewing decoherence are the two main challenges that stand in the way of the realization of a practical quantum computer in the laboratory. While the latter has been successfully addressed in trapped-ion and superconducting qubit platforms, significant progress on the former has been achieved with continuous-variable (CV) systems, all of them oscillators, in which qubits are replaced with ``qumodes.'' Examples of qumodes are the resonant modes of an optical parametric oscillator. Recently, the simultaneous entanglement of 60 frequency qumodes was demonstrated by our group using a single OPO while the entanglement of one million qumodes (two at a time) was demonstrated by Akira Furusawa's group at the University of Tokyo. If this talk, I will present our recent proposal to combine these two concepts of entanglement in the frequency and time domains to build a bona fide quantum computing processor.