Squeezed Quantum Processing with Photonics and Electronics

I 5656-N


Quantum information science is a boiling research field with the potential to transform many areas, including communications, computing, medicine, finance, or even our understanding of how the universe works. Unlike binary digits (bits) used in ordinary computer systems, quantum bits or “qubits” can operate in a superposition of states; thus, the computation based on qubits can solve problems that a traditional computer could never answer. Across all physical systems acting as candidates for qubits in large-scale quantum information processing (trapped atoms/ions, superconducting circuits, spin states), photons distinguish themselves by the absence of decoherence (detrimental to all other implementations). In order to use light as qubits capable of interacting together, the path forward relies on squeezed states and their combination in a large multidimensional quantum object known as a cluster state. Generating, manipulating, and measuring squeezed states by the hundreds is therefore highly desirable. While early demonstrations have been impressive, we set the route towards potential up-scaling to much bigger systems, which can only be enabled by integrating all the key elements onto the same technological platform. We will show that both the light source (squeezer), the optoelectronic detectors based on continuous quantum variables and the reconfigurable photonics circuitry can be put together onto a unique chip from the most mature silicon-based photonics platform to date.