Quantum optics articles within Nature Physics

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  • News & Views |

    When photons impinge on a material, free electrons can be created by the photoelectric effect. The emitted electron current usually fluctuates with Poisson statistics, but if squeezed quantum light is applied, the electrons bunch up.

    • Alfred Leitenstorfer
    •  & Peter Baum

  • Article |

    Photoemission experiments demonstrate that the photon number statistics of the exciting light can be imprinted on the emitted electrons, allowing the controlled generation of classical or non-classical electron number statistics of free electrons.

    • Jonas Heimerl
    • , Alexander Mikhaylov
    •  & Peter Hommelhoff

  • News & Views |

    Even by shining classical light on a single opening, one can perform a double-slit experiment and discover a surprising variety of quantum mechanical multi-photon correlations — thanks to surface plasmon polaritons and photon-number-resolving detectors.

    • Martijn Wubs

  • Article
    | Open Access

    Combining multiparticle levitation with cavity control enables cavity-mediated interaction between levitated nanoparticles, whose strength can be tailored via optical detuning and position of the two particles.

    • Jayadev Vijayan
    • , Johannes Piotrowski
    •  & Lukas Novotny

  • Article |

    Most applications of surface plasmons are based on their near-field properties. These properties are now shown to be governed by nonclassical scattering between multiparticle plasmonic subsystems.

    • Mingyuan Hong
    • , Riley B. Dawkins
    •  & Omar S. Magaña-Loaiza

  • Article |

    It has been suggested that Gaussian boson sampling may provide a quantum computational advantage for calculating the vibronic spectra of molecules. Now, an equally efficient classical algorithm has been identified.

    • Changhun Oh
    • , Youngrong Lim
    •  & Liang Jiang

  • Article |

    Achieving low decoherence is challenging in hybrid quantum systems. A superconducting-circuit-based optomechanical platform realizes millisecond-scale quantum state lifetime, which allows tracking of the free evolution of a squeezed mechanical state.

    • Amir Youssefi
    • , Shingo Kono
    •  & Tobias J. Kippenberg

  • Article |

    High-harmonic generation is a source of high-frequency radiation and is typically driven by strong, but classical, laser fields. A theoretical study now shows that using quantum light states as the driver extends the spectrum of outgoing radiation in a controllable manner.

    • Alexey Gorlach
    • , Matan Even Tzur
    •  & Ido Kaminer

  • Article |

    Some driven systems sustain non-equilibrium phases in which phase transitions occur without symmetry breaking. The use of a laser-cooled atomic cloud confined in a pencil beam now allows the demonstration of such a system.

    • Giovanni Ferioli
    • , Antoine Glicenstein
    •  & Antoine Browaeys

  • Article |

    Engineering the frequency spectrum of systems of multiple quantum emitters is the key for many quantum technologies. A cavity quantum electrodynamics experiment now demonstrates the real-time frequency modulation of cavity-protected polaritons.

    • Mohamed Baghdad
    • , Pierre-Antoine Bourdel
    •  & Romain Long

  • Article |

    Normally, quantum operations are thought of as being applied in a particular order, but it is possible to create superpositions of different orders. An experiment now demonstrates this indefinite causal order may give an advantage for quantum sensing.

    • Peng Yin
    • , Xiaobin Zhao
    •  & Guang-Can Guo

  • Research Briefing |

    Photon bound states are quantum states of light that emerge in systems with ultrahigh optical non-linearities. A single artificial atom was used to study the dynamics of these states, revealing that the number of photons within the pulse determines the time delay after the pulse scatters off the atom.

  • Article
    | Open Access

    Measurements on a single artificial atom—a quantum dot—coupled to an optical cavity show scattering dynamics that depend on the number of photons involved in the light–matter interaction, which is a signature of stimulated emission.

    • Natasha Tomm
    • , Sahand Mahmoodian
    •  & Richard J. Warburton

  • Article |

    The scalability of quantum information processing applications is generally hindered by loss and inefficient preparation and detection. A minimal loss network based on phonons has now been realized with trapped ions.

    • Wentao Chen
    • , Yao Lu
    •  & Kihwan Kim

  • News & Views |

    Strongly laser-driven quantum correlated many-body systems lead to the generation of light with exotic quantum features — the quantumness of a many-body system is imprinted on the state of the emitted light.

    • Paraskevas Tzallas

  • Article |

    Strongly driven light sources have become useful in many ways but are limited to classical emission. A quantum-optical theory now shows how non-classical states of light can be achieved from strongly-driven many-body systems, for example, non-coherent and correlated high-harmonic generation.

    • Andrea Pizzi
    • , Alexey Gorlach
    •  & Ido Kaminer

  • Article |

    Dynamic and disordered media destroy the correlations that underlie many quantum measurement protocols and applications. However, coherently backscattered photons can remain partially correlated due to interference between scattering trajectories.

    • Mamoon Safadi
    • , Ohad Lib
    •  & Yaron Bromberg

  • Article
    | Open Access

    Sufficient optical gain provided by Yb3+ doping allows phonon lasing from a levitated optomechanical system at the microscale, which exhibits strong mechanical amplitudes and nonlinear mechanical harmonics above the lasing threshold.

    • Tengfang Kuang
    • , Ran Huang
    •  & Guangzong Xiao

  • News & Views |

    A clever experiment with a photonic circuit has realized three-dimensional non-Abelian quantum behaviour — introducing an experimental testbed for field and gauge theories.

    • Andrew G. White

  • Editorial |

    The 2022 Nobel Prize in Physics has been awarded “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science”, a long-anticipated topic for the prize.

  • Perspective |

    It is not immediately obvious whether photons retain the information they carry when they traverse a disordered or multimodal medium. This Perspective discusses the extent to which the quantum properties of light can be preserved and controlled.

    • Ohad Lib
    •  & Yaron Bromberg

  • News & Views |

    All-optical devices hold promise as a platform for ultralow-power, sub-nanosecond photonic classical and quantum information processing. Measurements of the dynamics of a single photon switch unveil the quantum correlations at the root of its operation.

    • Victoria A. Norman
    •  & Marina Radulaski

  • Letter |

    Efficient interactions between two photons is a challenging requirement for quantum information processing. A quantum dot coupled to a waveguide produces strong interactions that can induce photon correlations and reshape two-photon wavepackets.

    • Hanna Le Jeannic
    • , Alexey Tiranov
    •  & Peter Lodahl

  • News & Views |

    Quantum computing operations are realized using acoustic devices, paving the way for a new type of quantum processor.

    • Amy Navarathna
    •  & Warwick P. Bowen

  • Article |

    Physical systems with continuous degrees of freedom can be used to implement quantum error correction codes. An autonomous correction protocol has now been used to extend the lifetime of a qubit encoded in the motion of a trapped ion.

    • Brennan de Neeve
    • , Thanh-Long Nguyen
    •  & Jonathan P. Home

  • Review Article |

    Interaction with light can be used to precisely control motional states. This Review surveys recent progress in the preparation of non-classical mechanical states and in the application of optomechanical platforms to specific tasks in quantum technology.

    • Shabir Barzanjeh
    • , André Xuereb
    •  & Eva M. Weig

  • News & Views |

    It has long been assumed that the quantum statistics of light are preserved when photons interact with plasmons. An analysis of the scattering process shows that this is not always the case, as light can mix and match different plasmonic pathways.

    • Mark Tame

  • News & Views |

    Integrating quantum technology with existing telecom infrastructure is hampered by a mismatch in operating frequencies. An optomechanical resonator now offers a strain-mediated spin–photon interface for long-distance quantum networks.

    • Lilian Childress
    •  & Jack Sankey

  • Article |

    Atoms in a semiconductor can have non-zero nuclear spins, creating a large ensemble with many quantum degrees of freedom. An electron spin coupled to the nuclei of a semiconductor quantum dot can witness the creation of entanglement within the ensemble.

    • Dorian A. Gangloff
    • , Leon Zaporski
    •  & Mete Atatüre

  • News & Views |

    In a study on high-harmonic generation from a dense atomic xenon gas, the strong-field light–matter interaction is shown to leave a quantum mechanical imprint on the incident light that escapes the semiclassical picture of strong-field physics.

    • Thomas Fennel

  • Article |

    By exploiting polarization entanglement between photons, quantum holography can circumvent the need for first-order coherence that is vital to classical holography.

    • Hugo Defienne
    • , Bienvenu Ndagano
    •  & Daniele Faccio

  • News & Views |

    An atomic spin oscillator coupled to a mechanical membrane resonator forms an effective negative-mass oscillator. Entanglement in this hybrid quantum system is created by a backaction-evading position measurement, despite the macroscopic separation.

    • Brian D’Urso
    •  & James Millen

  • Article |

    Einstein–Podolsky–Rosen entanglement between a millimetre-size mechanical membrane oscillator and a collective atomic spin oscillator formed by an ensemble of caesium atoms is achieved, although the two systems are spatially separated by one metre.

    • Rodrigo A. Thomas
    • , Michał Parniak
    •  & Eugene S. Polzik

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