High-efficiency microwave-optical quantum transduction based on a cavity electro-optic superconducting system with long coherence time

Modulation efficiency of a LiNbO3 waveguide electro-optic intensity modulator operating at high microwave frequency.

The modulation efficiency, at high-frequency microwave modulation, of a LiNbO(3) waveguide electro-optic modulator is shown to be degraded severely, especially when it is used as a frequency translator in a Brillouin-distributed fiber-sensing system. We derive an analytical expression for this attenuation regarding the phase-velocity mismatch and the impedance mismatch during the modulation pro...

Holonomic quantum computation using rf superconducting quantum interference devices coupled through a microwave cavity

A high-efficiency fiber-based imaging system for co-registered autofluorescence and optical coherence tomography.

We present a power-efficient fiber-based imaging system capable of co-registered autofluorescence imaging and optical coherence tomography (AF/OCT). The system employs a custom fiber optic rotary joint (FORJ) with an embedded dichroic mirror to efficiently combine the OCT and AF pathways. This three-port wavelength multiplexing FORJ setup has a throughput of more than 83% for collected AF emiss...

High-Q photonic resonators and electro-optic coupling using silicon-on-lithium-niobate

Future quantum networks, in which superconducting quantum processors are connected via optical links, will require microwave-to-optical photon converters that preserve entanglement. A doubly-resonant electro-optic modulator (EOM) is a promising platform to realize this conversion. Here, we present our progress towards building such a modulator by demonstrating the optically-resonant half of the...

Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity

The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric ...