Kavli Affiliate: Alireza Marandi
| First 5 Authors: James Williams, Elina Sendonaris, Rajveer Nehra, Robert M Gray, Ryoto Sekine
| Summary:
Squeezed vacuum, a fundamental resource for continuous-variable quantum
information processing, has been used to demonstrate quantum advantages in
sensing, communication, and computation. While most experiments use homodyne
detection to characterize squeezing and are therefore limited to electronic
bandwidths, recent experiments have shown optical parametric amplification
(OPA) to be a viable measurement strategy. Here, we realize OPA-based quantum
state tomography in integrated photonics and demonstrate the generation and
all-optical Wigner tomography of squeezed vacuum in a nanophotonic circuit. We
employ dispersion engineering to enable the distortion-free propagation of
femtosecond pulses and achieve ultrabroad operation bandwidths, effectively
lifting the speed restrictions imposed by traditional electronics on quantum
measurements with a theoretical maximum clock speed of 6.5 THz. We implement
our circuit on thin-film lithium niobate, a platform compatible with a wide
variety of active and passive photonic components. Our results chart a course
for realizing all-optical ultrafast quantum information processing in an
integrated room-temperature platform.
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