Quantum optics articles within Nature Photonics

Featured

  • Meeting Report |

    Metasurfaces bring miniaturization and new avenues for the generation, manipulation and measurement of quantum light.

    • David Pile

  • Article
    | Open Access

    Free-electron homodyne detection allows measuring phase-resolved optical responses in electron microscopy, demonstrated in the imaging of plasmonic fields with few-nanometre spatial and sub-cycle temporal resolutions.

    • John H. Gaida
    • , Hugo Lourenço-Martins
    •  & Claus Ropers

  • Article |

    Dynamic resonance fluorescence spectra beyond the Mollow-triplet are observed in a In(Ga)As quantum dot in a micropillar. Multiple side peaks, excitation-induced spectral asymmetry, and cavity filtering effects are experimentally observed and theoretically reproduced by a full quantum model that includes phonon-induced decoherence.

    • Shunfa Liu
    • , Chris Gustin
    •  & Jin Liu

  • Article |

    A skyrmion is a topologically stable field configuration. A non-local skyrmion, which has been hitherto elusive in condensed-matter physics, is realized by using entangled photons with a non-trivial topology. The connection between the notions of topology and entanglement is investigated, revealing topological invariance even when entanglement is fragile.

    • Pedro Ornelas
    • , Isaac Nape
    •  & Andrew Forbes

  • News & Views |

    A coherent microwave-to-optical conversion scheme, previously feasible only under cryogenic environments, has now been expanded to ambient conditions by using Rydberg atoms.

    • Kai-Yu Liao
    • , Hui Yan
    •  & Shi-Liang Zhu

  • News & Views |

    A scheme for fast, comprehensive characterization of high-dimensional quantum states could aid quantum applications in imaging and information processing.

    • Gregory Kanter
    •  & Prem Kumar

  • Article
    | Open Access

    Continuous-wave conversion of a 13.9 GHz field to a near-infrared optical signal is demonstrated by using Rydberg atoms at room temperature. The conversion bandwidth is 16 MHz and the conversion dynamic range is 57 dB, descending down to 3.8 K noise-equivalent temperature.

    • Sebastian Borówka
    • , Uliana Pylypenko
    •  & Michał Parniak

  • News & Views |

    Researchers have developed efficient electro-optic tools for manipulating the time and frequency of single photons by taking inspiration from Fresnel lenses.

    • John M. Donohue

  • Article
    | Open Access

    Biphoton digital holography is developed to perform quantum state tomography in a short measurement time. The interference between an unknown and a reference biphoton state is used to retrieve amplitude and phase information through coincidence imaging on a time-stamping camera.

    • Danilo Zia
    • , Nazanin Dehghan
    •  & Ebrahim Karimi

  • News & Views |

    Contrary to intuition, photons do not have to be indistinguishable for maximum photon bunching to occur. Partially indistinguishable photons can exhibit pronounced bunching.

    • Andrea Crespi

  • Article
    | Open Access

    The incoherent component of the fluorescence from a single two-level atom is investigated after rejecting the coherent component. Contrary to intuition, its photon statistics experimentally shows strong photon bunching. This result suggests that the atom does in fact simultaneously scatter two photons.

    • Luke Masters
    • , Xin-Xin Hu
    •  & Jürgen Volz

  • Article |

    Large perovskite nanocrystals are synthesized to increase the cryogenic exciton radiative rate. At liquid helium temperatures, single photons from perovskite nanocrystals coalesce at a beam splitter, signalling the existence of indistinguishable photon emission.

    • Alexander E. K. Kaplan
    • , Chantalle J. Krajewska
    •  & Moungi G. Bawendi

  • Article |

    A special-purpose quantum simulator, based on a coherently controlled broadband quantum frequency comb produced in a chip-scale dynamically modulated monolithic lithium niobate microresonator, is demonstrated, opening paths for chip-scale implementation of large-scale analogue quantum simulation and computation in the time–frequency domain.

    • Usman A. Javid
    • , Raymond Lopez-Rios
    •  & Qiang Lin

  • Article |

    A common belief about boson bunching—fully indistinguishable bosons exhibit the utmost bunching—is theoretically disproved with seven photons of distinct polarization in a seven-mode interferometric process. Enhanced bunching could thus be observed with partially distinguishable photons.

    • Benoit Seron
    • , Leonardo Novo
    •  & Nicolas J. Cerf

  • Article |

    Strong-field approximation theory is extended to account for non-classical driving light. This extended theory predicts that ultrafast dynamics of strongly light-driven matter significantly depends on the quantum state of the driving light, particularly on its photon statistics.

    • Matan Even Tzur
    • , Michael Birk
    •  & Oren Cohen

  • Article |

    To bridge the ultrafast and slow classes of quantum-information-processing systems, a Fresnel time lens is developed by using a wideband electro-optic phase modulator combined with a dispersion element. The single-photon spectral bandwidth is compressed from picosecond to nanosecond timescales.

    • Filip Sośnicki
    • , Michał Mikołajczyk
    •  & Michał Karpiński

  • Article |

    Propagators of single photons based on directly measuring quantum wave functions are experimentally observed. Classical trajectories that satisfy the principle of least action are successfully extracted in the case of free space and harmonic potential.

    • Yong-Li Wen
    • , Yunfei Wang
    •  & Shi-Liang Zhu

  • Article |

    Joint force measurements with entangled optical probes on two optomechanical sensors are demonstrated. The force sensitivity is improved by 40% in the shot-noise-dominant regime. The sensing bandwidth is improved by 20% in the thermal noise limit.

    • Yi Xia
    • , Aman R. Agrawal
    •  & Zheshen Zhang

  • Article
    | Open Access

    An electrically driven on-chip light source of entangled photon pairs is developed by combining an InP gain section and Si3N4 microrings. A pair generation rate of 8,200 counts s−1 and a coincidence-to-accidental ratio of more than 80 are achieved around the wavelength of 1,550 nm.

    • Hatam Mahmudlu
    • , Robert Johanning
    •  & Michael Kues

  • Article |

    An entanglement filter based on Rydberg atoms is demonstrated. It transmits a desired photonic entangled state and blocks unwanted ones. Near-perfect photonic entanglement can be extracted from a noisy input with arbitrarily low initial fidelity.

    • Gen-Sheng Ye
    • , Biao Xu
    •  & Lin Li

  • Article |

    Non-Gaussian Wigner-negative freely propagating optical quantum states are deterministically generated with a 60% photon generation efficiency. An evolution from quadrature squeezing to Wigner negativity is observed by changing the qubit rotation angle.

    • Valentin Magro
    • , Julien Vaneecloo
    •  & Alexei Ourjoumtsev

  • Article
    | Open Access

    A graph-theoretical programmable quantum photonic device composed of about 2,500 components is fabricated on a silicon substrate within a 12 mm × 15 mm footprint. It shows the generation, manipulation and certification of genuine multiphoton multidimensional entanglement, as well as the implementations of scattershot and Gaussian boson sampling.

    • Jueming Bao
    • , Zhaorong Fu
    •  & Jianwei Wang

  • Article
    | Open Access

    A continuous string of indistinguishable photons entangled in a cluster state is generated on demand from an InAs/GaAs quantum dot. The confined heavy-hole spin is used as an entangler. Under an externally tuned magnetic field, an optimized characteristic entanglement decay length of about ten photons is obtained.

    • Dan Cogan
    • , Zu-En Su
    •  & David Gershoni

  • News & Views |

    A scheme for converting qubits between two different representations, discrete and continuous variables, paves the way for more-efficient quantum networks.

    • Hyunseok Jeong

  • News & Views |

    The resonance wavelengths of optical Möbius strip microcavities can be continuously tuned via geometric phase manipulation by changing the thickness-to-width ratio of the strip.

    • Bruno Piccirillo
    •  & Verónica Vicuña-Hernández

  • Article |

    A conversion of quantum information between single-photon and cat-state qubits is demonstrated by teleportation using optical hybrid entanglement. The classical limit of conversion is exceeded over the full Bloch sphere, with an average fidelity above 79%.

    • Tom Darras
    • , Beate Elisabeth Asenbeck
    •  & Julien Laurat

  • News & Views |

    Using two different designs of superconductor-based detectors, two independent research groups report photon number detection for light pulses with up to 100 photons.

    • Tim J. Bartley

  • Article |

    A spatially multiplexed detection system of three transition-edge sensors is developed to resolve photon numbers up to 100 in a single laser pulse. Using the detector to measure parity of a coherent state allows for the extraction of quantum random numbers.

    • Miller Eaton
    • , Amr Hossameldin
    •  & Olivier Pfister

  • News & Views |

    Experimental confirmation that the Gouy phase can modify the photonic de Broglie wavelength opens up many exciting directions in metrology using quantum systems with higher-order Gaussian modes.

    • Xuemei Gu
    •  & Mario Krenn

  • Article
    | Open Access

    A single beamline interferometer with different two-photon N00N states is implemented through spatial tailoring of photon pairs. It enables the observation of the speed-up of the quantum Gouy phase — the phase acquired by the N-photon number state of paraxial modes upon propagation.

    • Markus Hiekkamäki
    • , Rafael F. Barros
    •  & Robert Fickler

  • News & Views |

    The energy exchange between two Rydberg atoms is induced and observed on a nanosecond timescale, paving the way for ultrafast quantum gates.

    • Peng Xu
    •  & Ming-Sheng Zhan

  • News & Views |

    A new method enables precise control of spin qubits in diamond by selectively activating them with a laser beam, thus paving the way to the control of spin qubits in dense arrays for applications in quantum technology.

    • Tim Hugo Taminiau

  • Article |

    Up to six photons in a Greenberger–Horne–Zeilinger state are sequentially generated by using a Rydberg superatom—a mesoscopic atomic ensemble under the condition of strong Rydberg blockade. The efficiency scaling factor for adding one photon is 0.27.

    • Chao-Wei Yang
    • , Yong Yu
    •  & Jian-Wei Pan

  • News & Views |

    A micropillar cavity that can impart a phase shift to single photons offers a promising route to scalable quantum information processing with light.

    • Stephan Dürr

  • Article |

    A superradiant photonic engine is developed by using a 138Ba atomic beam and a high-finesse optical cavity. The mirrors of a Fabry–Pérot cavity act as the piston of an engine. The achieved engine temperature and efficiency are 1.5 × 105 K and 98%, respectively.

    • Jinuk Kim
    • , Seung-hoon Oh
    •  & Kyungwon An

  • Letter |

    Giant effective photon–photon interactions are achieved by hybridizing light with excitons in an InGaAs-based quantum well micropillar cavity. Cross-phase modulation of up to 3 mrad per polariton is observed at the laser intensity below the single-photon level.

    • Tintu Kuriakose
    • , Paul M. Walker
    •  & Dmitry N. Krizhanovskii

  • News & Views |

    Non-Abelian braiding, an essential process for realizing topological quantum computation, is implemented using an array of photonic integrated waveguides.

    • Stefan Scheel
    •  & Alexander Szameit

  • News & Views |

    Non-reciprocal physical systems exhibit direction-dependent propagation of light, enabling a myriad of devices such as diodes and circulators. A new experiment demonstrates non-reciprocal amplification of light via atomic spins, driving photons on a one-way street through optical nanofibres.

    • Kanu Sinha
    •  & Elizabeth A. Goldschmidt

  • Article |

    A photon-number Bell state is generated from a quantum dot by controlling the light–matter entanglement during spontaneous emission. This excitation protocol can be scaled up by using N consecutive π-pulses to deliver multimode photonic entanglement.

    • Stephen C. Wein
    • , Juan C. Loredo
    •  & Carlos Antón-Solanas

  • News & Views |

    A record-breaking microwave-to-optics conversion efficiency of 82% over a 1 MHz bandwidth for low photon numbers is achieved by using a gas of Rydberg atoms, paving the way towards applications in quantum technologies.

    • Jacob P. Covey

  • Article |

    Superfluorescence—the collective emission of fluorescent light—is observed at temperatures up to 330 K in lead halide perovskite thin films. This finding suggests an intrinsic mechanism for protecting the electronic coherence in these materials.

    • Melike Biliroglu
    • , Gamze Findik
    •  & Kenan Gundogdu

  • Article
    | Open Access

    A quantum-optical memristor is realized by means of a laser-written integrated photonic circuit. The memristive dynamics of the device is fully characterized. A memristor-based quantum reservoir computer is proposed as a possible application.

    • Michele Spagnolo
    • , Joshua Morris
    •  & Philip Walther

  • News & Views |

    Harnessing birefringence in a photonic chip featuring an array of coupled waveguides brings new opportunities for investigating quantum effects such as bunching and antibunching.

    • Hao Tang
    •  & Xian-Min Jin

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