Temporal modes of quantum states of light scattered by a two-level system

• URL: http://arxiv.org/abs/2606.29974v1
• Date: Mon, 29 Jun 2026 08:48:37 GMT
• Title: Temporal modes of quantum states of light scattered by a two-level system
• Abstract summary: Non-Gaussian quantum states of light are of paramount importance to quantum computing.<n>We characterize the light stemming from one of the most fundamental quantum optics configurations.<n>By numerically decomposing the output state in terms of its principal modes, we find that it is possible to map single-mode two-photon inputs to be into two-mode entangled output states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-Gaussian quantum states of light are of paramount importance to quantum computing. Nevertheless, their deterministic generation is challenging problem due to the difficulty to control nonlinearities in physical systems. In this work, we characterize the light stemming from one of the most fundamental quantum optics configurations: the unidirectional scattering of multimode and multiphoton light by a two-level system. We provide an analytic and explicit description of the output light solely in terms of the corresponding input temporal modes which allows a straightforward physical interpretation and is computationally more effective compared to numerical methods. Then, we focus on the specific case of the scattering of two photons in a single mode. By numerically decomposing the output state in terms of its principal modes, we find that it is possible to map single-mode two-photon inputs to be into two-mode entangled output states, i.e., two-photon NOON states, to very good approximation. The latter states, in turn, are known to have more Wigner negativity compared to the associated input, which ultimately suggests a potential application of our considered setup in the deterministic generation of non-Gaussian states.

Related papers

• Emulation of Coherent Absorption of Quantum Light in a Programmable Linear Photonic Circuit [2.7586838672301934]
  Non-Hermitian quantum systems offer powerful tools for manipulating quantum states through engineered loss.<n>We demonstrate a fully programmable implementation of nonunitary transformations that emulate coherent absorption of quantum light.<n>The experiment integrates quantum state generation, programmable photonic circuitry, and photon-number-resolving detection.
  arXiv  Detail & Related papers  (2025-10-02T20:18:50Z)
• Is the EPR paradox really a paradox? [45.88028371034407]
  A system with a source of two photons in a singlet state and two photon detectors is considered in detail.<n>It is shown that the condition of operation of one detector with a given direction of photon polarization uniquely determines the adequate choice of direction and polarization for the second detector.
  arXiv  Detail & Related papers  (2025-09-02T08:34:11Z)
• Wigner-negative states in the steady-state emission of a two-level system driven by squeezed light [0.0]
  Propagating modes of light with negative-valued Wigner distributions are of fundamental interest in quantum optics.<n>We show the possibility of deterministic generation of Wigner-negativity in temporal modes of the steady-state emission of a two-level system driven by finite-bandwidth quadrature-squeezed light.
  arXiv  Detail & Related papers  (2024-08-03T07:39:46Z)
• Entanglement of photonic modes from a continuously driven two-level system [34.50067763557076]
  We experimentally generate entangled photonic modes by continuously exciting a quantum emitter, a superconducting qubit, with a coherent drive.<n>We show that entanglement is generated between modes extracted from the two sidebands of the resonance fluorescence spectrum.<n>Our approach can be utilized to distribute entanglement at a high rate in various physical platforms.
  arXiv  Detail & Related papers  (2024-07-10T18:48:41Z)
• Passive photonic CZ gate with two-level emitters in chiral multi-mode waveguide QED [41.94295877935867]
  We design a passive conditional gate between co-propagating photons using an array of only two-level emitters. The key resource is to harness the effective photon-photon interaction induced by the chiral coupling of the emitter array to two waveguide modes. We show how to harness this non-linear phase shift to engineer a conditional, deterministic photonic gate in different qubit encodings.
  arXiv  Detail & Related papers  (2024-07-08T18:00:25Z)
• Subtraction and Addition of Propagating Photons by Two-Level Emitters [2.321156230142032]
  We show that a passive two-level nonlinearity suffices to implement non-Gaussian quantum operations on propagating field modes. We accurately describe the single-photon subtraction process by elements of an intuitive quantum-trajectory model.
  arXiv  Detail & Related papers  (2024-04-18T16:55:33Z)
• Strong coupling between a single-photon and a two-photon Fock state [44.00303450801203]
  We report an experimental observation of the strong coupling between a single-photon and a two-photon Fock state in an ultrastrongly-coupled circuit-QED system.<n>Results represent a key step towards a new regime of quantum nonlinear optics.
  arXiv  Detail & Related papers  (2024-01-05T10:23:14Z)
• All-optical modulation with single-photons using electron avalanche [66.27103948750306]
  We demonstrate all-optical modulation enabled by electron avalanche process in silicon.<n>Our approach opens the possibility of gigahertz-speed, and potentially even faster, optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• Experimental realization of deterministic and selective photon addition in a bosonic mode assisted by an ancillary qubit [33.7054351451505]
  Bosonic quantum error correcting codes are primarily designed to protect against single-photon loss.<n>Error correction requires a recovery operation that maps the error states -- which have opposite parity -- back onto the code states.<n>Here, we realize a collection of photon-number-selective, simultaneous photon addition operations on a bosonic mode.
  arXiv  Detail & Related papers  (2022-12-22T23:32:21Z)
• Experimental Multi-state Quantum Discrimination in the Frequency Domain with Quantum Dot Light [40.96261204117952]
  In this work, we present the experimental realization of a protocol employing a time-multiplexing strategy to optimally discriminate among eight non-orthogonal states. The experiment was built on a custom-designed bulk optics analyser setup and single photons generated by a nearly deterministic solid-state source. Our work paves the way for more complex applications and delivers a novel approach towards high-dimensional quantum encoding and decoding operations.
  arXiv  Detail & Related papers  (2022-09-17T12:59:09Z)
• Superposition of two-mode squeezed states for quantum information processing and quantum sensing [55.41644538483948]
  We investigate superpositions of two-mode squeezed states (TMSSs) TMSSs have potential applications to quantum information processing and quantum sensing.
  arXiv  Detail & Related papers  (2021-02-01T18:09:01Z)
• Engineering continuous and discrete variable quantum vortex states by nonlocal photon subtraction in a reconfigurable photonic chip [0.0]
  We study the production of entangled two- and N-mode quantum states of light in optical waveguides. We propose a quantum photonic circuit that produces a reconfigurable superposition of photon subtraction on two single-mode squeezed states.
  arXiv  Detail & Related papers  (2020-04-11T11:11:16Z)

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.