Generating Spatially Entangled Itinerant Photons with Waveguide Quantum Electrodynamics

• URL: http://arxiv.org/abs/2003.07300v2
• Date: Tue, 23 Jun 2020 12:51:21 GMT
• Title: Generating Spatially Entangled Itinerant Photons with Waveguide Quantum Electrodynamics
• Authors: Bharath Kannan, Daniel Campbell, Francisca Vasconcelos, Roni Winik, David Kim, Morten Kjaergaard, Philip Krantz, Alexander Melville, Bethany M. Niedzielski, Jonilyn Yoder, Terry P. Orlando, Simon Gustavsson, William D. Oliver
• Abstract summary: In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. We generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies.
• Score: 43.53795072498062
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Realizing a fully connected network of quantum processors requires the ability to distribute quantum entanglement. For distant processing nodes, this can be achieved by generating, routing, and capturing spatially entangled itinerant photons. In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. In particular, we generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies. Using quadrature amplitude detection, we reconstruct the moments and correlations of the photonic modes and demonstrate state preparation fidelities of $84\%$. Our results provide a path towards realizing quantum communication and teleportation protocols using itinerant photons generated by quantum interference within a waveguide quantum electrodynamics architecture.

Related papers

• On-demand shaped photon emission based on a parametrically modulated qubit [14.88027830561737]
  A single-rail and dual-rail time-bin shaped photon generator can act as a quantum interface of a point-to-point quantum network. We develop an efficient photon field measurement setup based on the data stream processing of GPU. The results demonstrate that our method is hardware efficient, simple to implement, and scalable.
  arXiv  Detail & Related papers  (2024-05-02T16:53:54Z)
• Quantum-limited millimeter wave to optical transduction [50.663540427505616]
  Long distance transmission of quantum information is a central ingredient of distributed quantum information processors. Current approaches to transduction employ solid state links between electrical and optical domains. We demonstrate quantum-limited transduction of millimeter-wave (mmwave) photons into optical photons using cold $85$Rb atoms as the transducer.
  arXiv  Detail & Related papers  (2022-07-20T18:04:26Z)
• Chiral SQUID-metamaterial waveguide for circuit-QED [6.218498009194957]
  We propose a method to engineer 1D Josephson microwave waveguide as a chiral metamaterial. We analyze both Markovian and non-Markovian quantum dynamics, and find that superconducting qubits can dissipate photons unidirectionally. Our work might open the possibilities to exploit SQUID metamaterials realizing unidirectional photon transport in circuit-QED platforms.
  arXiv  Detail & Related papers  (2022-06-14T03:45:41Z)
• On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics [38.42250061908039]
  We demonstrate high-fidelity, on-demand, directional, microwave photon emission. We do this using an artificial molecule comprising two superconducting qubits strongly coupled to a bidirectional waveguide. This circuit will also be capable of photon absorption, making it suitable for building interconnects within quantum networks.
  arXiv  Detail & Related papers  (2022-03-02T21:45:00Z)
• Slowing down light in a qubit metamaterial [98.00295925462214]
  superconducting circuits in the microwave domain still lack such devices. We demonstrate slowing down electromagnetic waves in a superconducting metamaterial composed of eight qubits coupled to a common waveguide. Our findings demonstrate high flexibility of superconducting circuits to realize custom band structures.
  arXiv  Detail & Related papers  (2022-02-14T20:55:10Z)
• An integrated whispering-gallery-mode resonator for solid-state coherent quantum photonics [6.082529164787429]
  We report on an integrated microdisk cavity containing self-assembled quantum dots to coherently route photons. We show how this integrated system can coherently re-route photons between the drop and bus ports. We discuss the strengths and limitations of this approach, focusing on how it can be used to increase the efficiency of quantum devices.
  arXiv  Detail & Related papers  (2021-07-26T12:51:39Z)
• Waveguide quantum electrodynamics: collective radiance and photon-photon correlations [151.77380156599398]
  Quantum electrodynamics deals with the interaction of photons propagating in a waveguide with localized quantum emitters. We focus on guided photons and ordered arrays, leading to super- and sub-radiant states, bound photon states and quantum correlations with promising quantum information applications.
  arXiv  Detail & Related papers  (2021-03-11T17:49:52Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Hyperentanglement in structured quantum light [50.591267188664666]
  Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes. We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
  arXiv  Detail & Related papers  (2020-06-02T18:00:04Z)
• Quantum transduction of optical photons from a superconducting qubit [0.0]
  We demonstrate the conversion of a microwave-frequency excitation of a superconducting transmon qubit into an optical photon. With proposed improvements in the device and external measurement set-up, such quantum transducers may lead to practical devices capable of realizing new hybrid quantum networks.
  arXiv  Detail & Related papers  (2020-04-09T22:34:40Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.