Kavli Affiliate: Ali Hajimiri
| First 5 Authors: Volkan Gurses, Samantha I. Davis, Neil Sinclair, Maria Spiropulu, Ali Hajimiri
| Summary:
Emerging technologies that employ quantum physics offer fundamental
enhancements in information processing tasks, including sensing,
communications, and computing. Here, we introduce the quantum phased array,
which generalizes the operating principles of phased arrays and wavefront
engineering to quantum fields, and report the first quantum phased array
technology demonstration. An integrated photonic-electronic system is used to
manipulate free-space quantum information to establish reconfigurable wireless
quantum links in a standalone, compact form factor. Such a robust, scalable,
and integrated quantum platform can enable broad deployment of quantum
technologies with high connectivity, potentially expanding their use cases to
real-world applications. We report the first, to our knowledge,
free-space-to-chip interface for quantum links, enabled by 32 metamaterial
antennas with more than 500,000 sub-wavelength engineered nanophotonic elements
over a 550 x 550 $mathrm{mu m}^2$ physical aperture. We implement a
32-channel array of quantum coherent receivers with 30.3 dB shot noise
clearance and 90.2 dB common-mode rejection ratio that downconverts the quantum
optical information via homodyne detection and processes it coherently in the
radio-frequency domain. With our platform, we demonstrate 32-pixel imaging of
squeezed light for quantum sensing, reconfigurable free-space links for quantum
communications, and proof-of-concept entanglement generation for
measurement-based quantum computing. This approach offers targeted, real-time,
dynamically-adjustable free-space capabilities to integrated quantum systems
that can enable wireless quantum technologies.
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