Quantum information articles within Nature Photonics

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  • Article
    | Open Access

    A versatile cloud-accessible single-photon-based quantum computing machine is developed, which shows a six-photon sampling rate of 4 Hz over weeks. Heralded generation of a three-photon Greenberger–Horne–Zeilinger state—a key milestone toward measurement-based quantum computing—is implemented.

    • Nicolas Maring
    • , Andreas Fyrillas
    •  & Niccolo Somaschi

  • 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 |

    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

  • News & Views |

    Exceptionally high secret key generation rates of 64 Mbits–1 and 115.8 Mbits–1 over a 10 km optical fibre link have been achieved, thanks to custom-built 14-pixel and 16-pixel superconducting nanowire single-photon detectors, respectively, and the use of fast quantum key distribution transmitters.

    • Davide Bacco
    •  & Maja Colautti

  • 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
    | 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 |

    A quantum key distribution with a key rate of 115.8 Mb s–1 is demonstrated over 10 km standard optical fibre. To this end, a high-speed and stable system, an integrated transmitter for low error modulation and multipixel superconducting nanowire single-photon detectors are developed.

    • Wei Li
    • , Likang Zhang
    •  & Jian-Wei Pan

  • 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

  • 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

  • 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

  • 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

  • Article |

    Microwave-driven holonomic quantum gates on an optically selected electron spin in a nitrogen-vacancy centre in diamond are demonstrated. Optically addressable entanglement is generated between the electron and adjacent nitrogen nuclear spin.

    • Yuhei Sekiguchi
    • , Kazuki Matsushita
    •  & Hideo Kosaka

  • 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

  • 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

  • Article |

    A photonic anomalous Floquet insulator is emulated in a silicon photonic chip. Up to four-photon topologically protected entangled states are generated in a monolithically integrated emitter in ambient conditions through four-wave mixing on top of the edge modes of the insulator.

    • Tianxiang Dai
    • , Yutian Ao
    •  & Jianwei Wang

  • Article |

    Twin-field (TF) quantum key distribution (QKD) over a secure distance of 833.8 km is demonstrated even in the finite-size regime. To this end, an optimized four-phase TF-QKD protocol and a high-speed low-noise TF-QKD system are developed.

    • Shuang Wang
    • , Zhen-Qiang Yin
    •  & Zheng-Fu Han

  • News & Views |

    Quantum teleportation is demonstrated between light and the vibrations of a nanomechanical resonator, realizing a key capability for quantum computing.

    • Glen I. Harris
    •  & Warwick P. Bowen

  • Article |

    Quantum photonic integrated circuits for a standalone quantum secure communication system are developed and packaged into pluggable interconnects. The system is interfaced with 100 Gb s–1 data encryptors and its performance is evaluated over 10 km to 50 km fibre links.

    • Taofiq K. Paraïso
    • , Thomas Roger
    •  & Andrew J. Shields

  • News & Views |

    Photon propagation through an array of coupled waveguides arranged in various fractal patterns serves as a useful ‘optical simulator’ for revealing insights into quantum transport in complex scenarios.

    • Tamás Kiss
    •  & Igor Jex

  • Article |

    Quantum transport in fractal networks is experimentally investigated by performing continuous-time quantum walks in fractal photonic lattices. Contrarily to classical fractals, anomalous transport governed solely by the fractal dimension is observed.

    • Xiao-Yun Xu
    • , Xiao-Wei Wang
    •  & Xian-Min Jin

  • News & Views |

    A ‘twin-field’ repeater-less protocol has enabled an experimental demonstration of secure quantum key distribution over a 511-km long-haul optical fibre link.

    • Charles C.-W. Lim
    •  & Chao Wang

  • Article |

    Twin-field quantum key distribution over 600 km is demonstrated. The key ingredient for success is the dual-band phase stabilization that dramatically reduce the phase fluctuations on optical fibre by more than four orders of magnitude.

    • Mirko Pittaluga
    • , Mariella Minder
    •  & Andrew J. Shields

  • Letter
    | Open Access

    A nondestructive and complete Bell-state measurement is demonstrated between two 60-m-distant atomic qubits in different optical cavities. The main building block is a photon-atom gate, which is executed upon reflection of the photon from the cavity.

    • Stephan Welte
    • , Philip Thomas
    •  & Emanuele Distante

  • Article |

    Distributed quantum metrology is demonstrated for both individual and averaged phase shifts by using discrete-variable entangled photons. An error reduction of 4.7 dB below the shot-noise limit is achieved when a total number of photon passes is 21.

    • Li-Zheng Liu
    • , Yu-Zhe Zhang
    •  & Jian-Wei Pan

  • Letter |

    A heralded squeezing gate with near unit fidelity is demonstrated, even for modest ancillary squeezing. A heralding filter is implemented in the feed-forward operation. With 6 dB of ancillary squeezing, a fidelity of 0.985 is experimentally obtained.

    • Jie Zhao
    • , Kui Liu
    •  & Syed M. Assad

  • Letter |

    Programmable linear optical networks are implemented in a multimode fibre. The intermodal coupling between the spatial and polarization modes of the fibre is controlled by wavefront shaping. The network is used to emulate tunable coherent absorption.

    • Saroch Leedumrongwatthanakun
    • , Luca Innocenti
    •  & Sylvain Gigan

  • Review Article |

    This Review covers recent progress in integrated quantum photonics (IQP) technologies and their applications. The challenges and opportunities of realizing large-scale, monolithic IQP circuits for future quantum applications are discussed.

    • Jianwei Wang
    • , Fabio Sciarrino
    •  & Mark G. Thompson

  • Article |

    Following excitation with a resonant laser, on-demand generation of non-classical light states in photon-number superpositions of zero-, one- and two-photon Fock states is demonstrated from a GaAs-based cavity containing InAs quantum dots.

    • J. C. Loredo
    • , C. Antón
    •  & P. Senellart

  • Article |

    Single-photon sources with a single-photon efficiency of 0.60, a single-photon purity of 0.975 and an indistinguishability of 0.975 are demonstrated. This is achieved by fabricating elliptical resonators around site-registered quantum dots.

    • Hui Wang
    • , Yu-Ming He
    •  & Jian-Wei Pan

  • Article |

    An all-photonic quantum repeater is demonstrated by manipulating state-of-the-art 12-photon interferometry. The enhancement of entanglement-generation rate compared with parallel entanglement swapping proves the feasibility of the concept.

    • Zheng-Da Li
    • , Rui Zhang
    •  & Jian-Wei Pan

  • News & Views |

    The race of distributing provable-secure encryption keys by means of quantum key distribution over ever-increasing distances is on. A surprising development has now led to a new result that may affect how we build future quantum networks.

    • Wolfgang Tittel

  • Article |

    A quantum memory for single-photon polarization qubits with an efficiency of >85% and a fidelity of >99% is demonstrated. It is achieved by suppressing the noise and by controlling the spectral–temporal states of single photons in laser-cooled Rb atoms.

    • Yunfei Wang
    • , Jianfeng Li
    •  & Shi-Liang Zhu

  • Article |

    An atom–light Schrödinger-cat state is deterministically created by reflecting laser pulses from a high-finesse optical cavity containing a single 87Rb atom. A CNOT-type operation is also demonstrated between the atomic qubit and the optical qubit.

    • Bastian Hacker
    • , Stephan Welte
    •  & Gerhard Rempe

  • Letter |

    A quantum walker on a hexagonal glued array of optical waveguides is made inside a glass substrate. The optimal hitting time increases linearly with the layer depth, giving a quadratic speed-up over the hitting performance by classical random walks.

    • Hao Tang
    • , Carlo Di Franco
    •  & Xian-Min Jin

  • Article |

    A three-dimensionally entangled Greenberger–Horne–Zeilinger state, where all three photons reside in a qutrit space, is generated by developing a new multi-port in combination with a novel four-photon source entangled in orbital angular momentum.

    • Manuel Erhard
    • , Mehul Malik
    •  & Anton Zeilinger

  • Review Article |

    This Review covers recent progress in quantum technologies with optically addressable solid-state spins. A possible path to chip-scale quantum technologies through advances in nanofabrication, quantum control and materials engineering is described.

    • David D. Awschalom
    • , Ronald Hanson
    •  & Brian B. Zhou

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