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Certifiable Lower Bounds of Wigner Negativity Volume and Non-Gaussian Entanglement with Conditional Displacement Gates.
Phys Rev Lett
August 2024
Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543.
In circuit and cavity quantum electrodynamics devices where control qubits are dispersively coupled to high-quality-factor cavities, characteristic functions of cavity states can be directly probed with conditional displacement (CD) gates. In this Letter, I propose a method to certify non-Gaussian entanglement between cavities using only CD gates and qubit readouts. The CD witness arises from an application of Bochner's theorem to a surprising connection between two negativities: that of the reduced Wigner function, and that of the partial transpose.
View Article and Find Full Text PDFUnveiling atom-photon quasi-bound states in hybrid plasmonic-photonic cavity.
Nanophotonics
July 2022
School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China.
Dissipation, often associated with plasmons, leads to decoherence and is generally considered fatal for quantum nonlinearities and entanglement. Counterintuitively, by introducing a dissipative plasmonic nanoantenna into a typical cavity quantum electrodynamics (QED) system, we unveil the wide existence of the atom-photon quasi-bound state (qBS), a kind of exotic eigenstate with anomalously small decay, in the hybrid plasmonic-photonic cavity. To derive the analytical condition of atom-photon qBS, we formulate a quantized two-mode model of the local density of states by connecting the interacting uncoupled cavity modes to the macroscopic QED.
View Article and Find Full Text PDFQuantum control of bosonic modes with superconducting circuits.
Sci Bull (Beijing)
September 2021
Pritzker School of Molecular Engineering, University of Chicago, Illinois 60637, USA. Electronic address:
Bosonic modes have wide applications in various quantum technologies, such as optical photons for quantum communication, magnons in spin ensembles for quantum information storage and mechanical modes for reversible microwave-to-optical quantum transduction. There is emerging interest in utilizing bosonic modes for quantum information processing, with circuit quantum electrodynamics (circuit QED) as one of the leading architectures. Quantum information can be encoded into subspaces of a bosonic superconducting cavity mode with long coherence time.
View Article and Find Full Text PDFHeisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light.
Phys Rev Lett
August 2015
Department of Physics, McGill University, 3600 rue University, Montreal, Quebec H3A 2T8, Canada.
We show how to use two-mode squeezed light to exponentially enhance cavity-based dispersive qubit measurement. Our scheme enables true Heisenberg-limited scaling of the measurement, and crucially, it is not restricted to small dispersive couplings or unrealistically long measurement times. It involves coupling a qubit dispersively to two cavities and making use of a symmetry in the dynamics of joint cavity quadratures (a so-called quantum-mechanics-free subsystem).
View Article and Find Full Text PDFSuperconducting resonators as beam splitters for linear-optics quantum computation.
Phys Rev Lett
June 2010
Department of Physics, University of Konstanz, D-78457 Konstanz, Germany.
We propose and analyze a technique for producing a beam-splitting quantum gate between two modes of a ring-resonator superconducting cavity. The cavity has two integrated superconducting quantum interference devices (SQUIDs) that are modulated by applying an external magnetic field. The gate is accomplished by applying a radio frequency pulse to one of the SQUIDs at the difference of the two mode frequencies.
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