Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Jack Y. Qiu, Arne Grimsmo, Kaidong Peng, Bharath Kannan, Benjamin Lienhard
| Summary:
Squeezing of the electromagnetic vacuum is an essential metrological
technique that is used to reduce quantum noise in applications spanning
gravitational wave detection, biological microscopy, and quantum information
science. In circuit quantum electrodynamics, squeezed microwaves have been used
to suppress radiative spontaneous emission from a superconducting qubit and to
enhance the search for dark matter axions. However, the resonator-based
Josephson junction parametric amplifiers conventionally used to generate
squeezed microwaves are constrained by a narrow bandwidth and low dynamic range
which limits their utility. In this work, we develop a dual-pump, broadband
Josephson traveling-wave parametric amplifier (JTWPA) and use it to demonstrate
a 56 dB phase-sensitive extinction ratio, $-11.35^{+1.57}_{-2.49}$ dB
single-mode squeezing, and two-mode squeezing over a bandwidth of 1.75 GHz. The
phase-sensitive extinction ratio is the highest reported value to date for
Josephson-junction-based circuits and useful for qubit readout in quantum
computing and phase regeneration in quantum communications. The achieved
single-mode squeezing represents an order-of-magnitude reduction of vacuum
noise, on par with the best resonator-based squeezers. We have furthermore
demonstrated two-mode squeezing with the broadest bandwidth reported thus far
at microwave frequencies. The JTWPA is capable of simultaneously creating
entangled microwave photon pairs with a large frequency separation, enabling
new possibilities for applications including high-fidelity qubit readout,
quantum illumination and teleportation.
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