I will deliver an overview and progress of Xanadu’s photonic quantum computing architecture and the role that photonic chip integration plays in enabling its implementation.
In this paper, we present our recent results in the area of microwave photonics. Integrated microwave photonic bandpass
and bandstop filters were realized using stimulated Brillouin scattering (SBS). Our recent breakthrough in the fabrication
of chalcogenide waveguides has allowed us to achieve an on-chip SBS gain of >40 dB, enabling for the first time the
tailoring of the SBS response well beyond the intrinsic linewidth (~30 MHz). An electrical comb generated by an
arbitrary waveform generator was modulated onto an optical carrier to generate a broadened pump which via the SBS
effect created a flat and rectangular bandpass filter response in the RF domain. Controlling the number of pump lines
allowed bandwidth reconfigurability from 30 MHz to 440 MHz. The measured selectivity and the passband ripple were
>20 dB and <1.9 dB, respectively and the center frequency of the filter was tuned up to 30 GHz. A bandstop filter
response was realized by using a novel RF interferometry technique via accurate control of the amplitude and phase of
the sidebands of the modulated probe. The bandwidth was reconfigurable from 75 MHz-300 MHz and the central
frequency of the filter was tunable up to 30 GHz.
We show the first functional signal processing device based on forward stimulated Brillouin scattering from a silicon nanowire. We harness 1dB of SBS gain to create a high performance, energy efficient microwave photonic notch filter. The filter possess 48dB of suppression, 98 MHz linewidth, and is tunable within a 6 GHz bandwidth. This demonstration represents a significant advance in integrated microwave photonics with potential applications in on-chip microwave signal processing and establish the foundation towards the first CMOS-compatible high performance RF photonic filter.
We review recent demonstration of stimulated Brillouin scattering in a chalcogenide photonic chip and its application to
optical and microwave signal processing tasks. The interaction between light and sound via stimulated Brillouin scattering
(SBS) was exploited in chalcogenide photonic circuits to achieve on-chip SBS slow and fast light, microwave photonic
filters, and dynamic gratings using travelling-wave geometry. Using a ring-resonator geometry, photonic-chip based
Brillouin laser was demonstrated.
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