Quantum Correlations Across Many Nodes on a Qubit Lattice for Deterministic Photonic Quantum Computing and Generation of Fault-Tolerant Photonic Qubits

P5a

In this project, quantum correlations will be generated on a multidimensional optical qubit lattice. The foundation is laser light in quantum-squeezed states, a technology in which ILP/ZOQ has been a global leader for years. The spatial-temporal modes of light can, in principle, be assembled into nearly arbitrarily large lattices through interference. However, quantum correlations on this lattice have thus far been restricted to neighboring nodes, limiting the power of quantum algorithms. Leveraging extensive expertise in quantum-squeezed light, this project aims to deterministically demonstrate quantum correlations across many lattice nodes, enabling photonic quantum computing with more complex quantum algorithms than previously possible.

P5b

In photonic quantum computing, large lattices of quantum-correlated optical modes are generated deterministically using quantum-squeezed light. To fully harness the complexity of the quantum machine, errors due to decoherence must be correctable. This requires additional specially fault-tolerant states known as "GKP states." The research groups at ZOQ possess the necessary combination of expertise to realize the challenging generation of these states. Complex, multiple superpositions of different squeezed light amplitudes are coherently generated and meticulously examined with minimal loss.