Volume 16 Issue 3, March 2020

Volume 16 Issue 3

Oddly synchronised

An experiment with three alternating-current generators demonstrates converse symmetry breaking — a phenomenon whereby the system achieves frequency synchronization when its component systems are tuned asymmetrically.

See Nishikawa et al.

Image: Ferenc Molnar, University of Notre Dame; Takashi Nishikawa and Adilson E. Motter, Northwestern University. Cover Design: David Shand

Editorial

  • Editorial |

    The combination of microwave photons with superconducting quantum circuits offers promise for quantum technologies and the fundamental study of quantum light–matter interactions. This month, a Focus issue explores this field of research.

    Focus:

Comment

  • Comment |

    In 1985, experiments revealed the quantum behaviour of a macroscopic degree of freedom: the phase difference across a Josephson junction. The authors recount the history of this milestone for the development of superconducting quantum circuits.

    • John M. Martinis
    • , Michel H. Devoret
    •  & John Clarke

    Focus:

Thesis

Books & Arts

  • Books & Arts |

    • Christine-Maria Horejs

Research Highlights

News & Views

  • News & Views |

    Speed is of the essence when it comes to signal processing, but electronic switching times have reached a limit. Optically controlled tunnel currents across a nanoscale plasmonic gap could considerably accelerate future nanoelectronic devices.

    • Olga Smirnova

Perspectives

  • Perspective |

    This article puts in perspective the relationship between cavity and circuit quantum electrodynamics, two related approaches for studying the fundamental quantum interaction between light and matter.

    • S. Haroche
    • , M. Brune
    •  & J. M. Raimond

    Focus:

Review Articles

  • Review Article |

    Hybrid quantum systems combine heterogeneous physical systems for the implementation of new functionalities at the quantum level. This article reviews recent research on the creation of hybrid quantum systems within the circuit quantum electrodynamics framework.

    • A. A. Clerk
    • , K. W. Lehnert
    • , P. Bertet
    • , J. R. Petta
    •  & Y. Nakamura

    Focus:

  • Review Article |

    This Review Article surveys the physics of many-body quantum states formed by microwave photons in circuit quantum electrodynamics environments.

    • Iacopo Carusotto
    • , Andrew A. Houck
    • , Alicia J. Kollár
    • , Pedram Roushan
    • , David I. Schuster
    •  & Jonathan Simon

    Focus:

Letters

  • Letter |

    Experiments demonstrate quantum phase sensing with a four-mode entangled state, reaching a measurement precision that is beyond what can be achieved by separate individual probes.

    • Xueshi Guo
    • , Casper R. Breum
    • , Johannes Borregaard
    • , Shuro Izumi
    • , Mikkel V. Larsen
    • , Tobias Gehring
    • , Matthias Christandl
    • , Jonas S. Neergaard-Nielsen
    •  & Ulrik L. Andersen
  • Letter |

    The authors develop a high-spatial-resolution photoemission technique to show variation of the energy of the Dirac point of approximately 50 meV. They also find an interplay between bulk and surface states.

    • Erica Kotta
    • , Lin Miao
    • , Yishuai Xu
    • , S. Alexander Breitweiser
    • , Chris Jozwiak
    • , Aaron Bostwick
    • , Eli Rotenberg
    • , Wenhan Zhang
    • , Weida Wu
    • , Takehito Suzuki
    • , Joseph Checkelsky
    •  & L. Andrew Wray
  • Letter |

    A combined ARPES and DFT study of Ru- and Rh-substituted samples of Sr2IrO4 reveals a collapse of its correlated insulating phase that is controlled by spin–orbit coupling.

    • B. Zwartsenberg
    • , R. P. Day
    • , E. Razzoli
    • , M. Michiardi
    • , N. Xu
    • , M. Shi
    • , J. D. Denlinger
    • , G. Cao
    • , S. Calder
    • , K. Ueda
    • , J. Bertinshaw
    • , H. Takagi
    • , B. J. Kim
    • , I. S. Elfimov
    •  & A. Damascelli
  • Letter |

    In natural materials, defects determine many properties. In spin-analogue mechanical metamaterials, deterministically inserted topological defects enable the design of complex deformation and stress distributions.

    • Anne S. Meeussen
    • , Erdal C. Oğuz
    • , Yair Shokef
    •  & Martin van Hecke
  • Letter |

    The motor protein dynein is associated with microtubule force generation in the cell; how it interacts with cytoskeletal fluctuations is still an open question. Here the authors show that dynein can harness these fluctuations to generate power and move faster towards the minus-end of microtubules.

    • Yasin Ezber
    • , Vladislav Belyy
    • , Sinan Can
    •  & Ahmet Yildiz
  • Letter |

    Magnetic reconnection in the near-Earth magnetotail is observed to power a space storm, although suppression of magnetic reconnection caused by the Earth’s magnetic dipole was expected close to Earth.

    • Vassilis Angelopoulos
    • , Anton Artemyev
    • , Tai D. Phan
    •  & Yukinaga Miyashita

Articles

  • Article |

    The variational quantum unsampling protocol provides a way to realize verification and inference of near-term quantum circuit outputs. This protocol is then experimentally verified on a quantum photonic processor.

    • Jacques Carolan
    • , Masoud Mohseni
    • , Jonathan P. Olson
    • , Mihika Prabhu
    • , Changchen Chen
    • , Darius Bunandar
    • , Murphy Yuezhen Niu
    • , Nicholas C. Harris
    • , Franco N. C. Wong
    • , Michael Hochberg
    • , Seth Lloyd
    •  & Dirk Englund
  • Article |

    Following an impulsive laser excitation of a single molecule, a dispersed vibrational wave-packet is partially rephased by a second pulse, and a wave-packet echo is observed. This wave-packet echo probes ultrafast intramolecular processes in the isolated molecule.

    • Junjie Qiang
    • , Ilia Tutunnikov
    • , Peifen Lu
    • , Kang Lin
    • , Wenbin Zhang
    • , Fenghao Sun
    • , Yaron Silberberg
    • , Yehiam Prior
    • , Ilya Sh. Averbukh
    •  & Jian Wu
  • Article |

    The optical analogue of electromagnetically induced transparency and absorption can be modulated by chiral optical states at an exceptional point, which is shown in a system of indirectly coupled microresonators.

    • Changqing Wang
    • , Xuefeng Jiang
    • , Guangming Zhao
    • , Mengzhen Zhang
    • , Chia Wei Hsu
    • , Bo Peng
    • , A. Douglas Stone
    • , Liang Jiang
    •  & Lan Yang
  • Article |

    Single-cycle interferometric autocorrelation measurements of electrons tunnelling across the gap of a plasmonic bowtie antenna and quantitative models provide insight into the physical interactions that drive the electron transfer.

    • Markus Ludwig
    • , Garikoitz Aguirregabiria
    • , Felix Ritzkowsky
    • , Tobias Rybka
    • , Dana Codruta Marinica
    • , Javier Aizpurua
    • , Andrei G. Borisov
    • , Alfred Leitenstorfer
    •  & Daniele Brida
  • Article |

    Transport measurements show that nematic fluctuations near a phase transition increase the temperature at which superconductivity occurs by a factor of nearly six. This happens in a non-magnetic nickel-based compound.

    • Chris Eckberg
    • , Daniel J. Campbell
    • , Tristin Metz
    • , John Collini
    • , Halyna Hodovanets
    • , Tyler Drye
    • , Peter Zavalij
    • , Morten H. Christensen
    • , Rafael M. Fernandes
    • , Sangjun Lee
    • , Peter Abbamonte
    • , Jeffrey W. Lynn
    •  & Johnpierre Paglione
  • Article |

    An experiment with three alternating-current generators demonstrates converse symmetry breaking—a phenomenon whereby the system achieves frequency synchronization when its component systems are tuned asymmetrically.

    • Ferenc Molnar
    • , Takashi Nishikawa
    •  & Adilson E. Motter
  • Article |

    A detailed theoretical and experimental investigation of homogeneous cell tissues finds that they can undergo spontaneous spatial symmetry breaking through a purely electrophysiological mechanism.

    • Harold M. McNamara
    • , Rajath Salegame
    • , Ziad Al Tanoury
    • , Haitan Xu
    • , Shahinoor Begum
    • , Gloria Ortiz
    • , Olivier Pourquie
    •  & Adam E. Cohen

Amendments & Corrections

Measure for Measure

  • Measure for Measure |

    Philip Lössl tells of mass spectrometry’s struggles to come to terms with terminology.

    • Philip Lössl