Generating two continuous entangled microwave beams using a dc-biased Josephson junction

Abstract

We show experimentally that a dc-biased Josephson junction in series with two microwave resonators emits entangled beams of microwaves leaking out of the resonators. In the absence of a stationary phase reference for characterizing the entanglement of the outgoing beams, we measure second-order coherence functions for proving entanglement up to an emission rate of 2.5 billion photon pairs per second. The experimental results are found in quantitative agreement with theory, proving that the low frequency noise of the dc bias is the main limitation for the coherence time of the entangled beams. This agreement allows us to evaluate the entropy of entanglement of the resonators, and to identify the improvements that could bring this device closer to a useful bright source of entangled microwaves for quantum-technological applications.

References in corpus (45)

• Quantum entanglement
• Generating Entangled Microwave Radiation Over Two Transmission Lines
• Soundness and completeness of quantum root-mean-square errors
• Gaussian measures of entanglement versus negativities: the ordering of two-mode Gaussian states
• Quantum limited amplification and entanglement in coupled nonlinear resonators
• The Bright Side of Coulomb Blockade
• Widely tunable, non-degenerate three-wave mixing microwave device operating near the quantum limit
• Observation of Three-Photon Spontaneous Parametric Downconversion in a Superconducting Parametric Cavity
• Measurement of sub-shot-noise spatial correlations without subtraction of background
• Autonomous Quantum Refrigerator in a Circuit-QED Architecture Based on a Josephson Junction
• Counting statistics of photons produced by electronic shot noise
• Demonstration of an ac Josephson junction laser
• From Coulomb blockade to nonlinear quantum dynamics in a superconducting circuit with a resonator
• Antibunched photons emitted by a dc biased Josephson junction
• Antibunched photons emitted by a quantum point contact out of equilibrium
• Emission of non-classical radiation by inelastic Cooper pair tunneling
• Phase diffusion and charging effects in Josephson junctions
• Nonclassical photon pair production in a voltage-biased Josephson junction
• Josephson photonics with a two-mode superconducting circuit
• Quantum limited amplification from inelastic Cooper pair tunneling
• Time-resolved statistics of nonclassical light in Josephson photonics
• Finite-time quantum entanglement in propagating squeezed microwaves
• Fock-state stabilization and emission in superconducting circuits using dc-biased Josephson junctions
• Quantum optics theory of electronic noise in coherent conductors
• Experimental Violation Of Bell-like Inequalities By Electronic Shot Noise
• Observation of broadband entanglement in microwave radiation from a single time-varying boundary condition
• Emission of Microwave Photon Pairs by a Tunnel Junction
• Proposal for an optical laser producing light at half the Josephson frequency
• A bright on-demand source of anti-bunched microwave photons based on inelastic Cooper pair tunneling
• Cavity quantum electrodynamics with an out-of-equilibrium quantum dot
• Self-consistent dynamics of a Josephson junction in presence of an arbitrary environment
• Entanglement Rate for Gaussian Continuous Variable Beams
• Input-output description of microwave radiation in the dynamical Coulomb blockade
• Theory of interactions between cavity photons induced by a mesoscopic circuit
• Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction
• A unified approach to entanglement criteria using the Cauchy-Schwarz and Hölder inequalities
• Interacting electrodynamics of short coherent conductors in quantum circuits
• Second-order coherence of microwave photons emitted by a quantum point contact
• Quantum Properties of the radiation emitted by a conductor in the Coulomb Blockade Regime
• Nonzero temperature effects on antibunched photons emitted by a quantum point contact out of equilibrium
• Lasing at half the Josephson frequency with exponentially long coherence times
• Theory of double Cooper-pair tunneling and light emission mediated by a resonator
• Light-superconducting interference devices
• Quantum dynamics of a microwave resonator strongly coupled to a tunnel junction
• Electron-photon coupling in Mesoscopic Quantum Electrodynamics

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