Quantum dots articles within Nature Physics

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  • Article
    | Open Access

    A successful silicon spin qubit design should be rapidly scalable by benefiting from industrial transistor technology. This investigation of exchange interactions between two FinFET qubits provides a guide to implementing two-qubit gates for hole spins.

    • Simon Geyer
    • , Bence Hetényi
    •  & Andreas V. Kuhlmann

  • Article
    | Open Access

    Interactions between a localized magnetic moment and electrons in a metal can produce an emergent resonance that affects the metal’s properties. A realization of this Kondo effect in MoS2 provides an opportunity to study it in microscopic detail.

    • Camiel van Efferen
    • , Jeison Fischer
    •  & Wouter Jolie

  • News & Views |

    Measurements of two neighbouring silicon-based qubits show that the charge noise they each experience is correlated, suggesting a common origin. Understanding these correlations is crucial for performing error correction in these systems.

    • Łukasz Cywiński

  • Article |

    Established methods of controlling silicon spin qubits require high-frequency signals that can be difficult to implement for various reasons. Exploiting the coupling between spin and valley degrees of freedom provides an alternative approach.

    • Xinxin Cai
    • , Elliot J. Connors
    •  & John M. Nichol

  • News & Views |

    Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.

    • Julien Madéo
    •  & Keshav M. Dani

  • 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 |

    Two-level quantum systems are routinely excited by resonant pump beams. Experiments now show resonant excitation through dichromatic, detuned pumps — providing a coherent control technique that will also aid single-photon emission from solid-state devices.

    • Glenn S. Solomon

  • News & Views |

    Through stochastic resonance, noise-driven fluctuations make an otherwise weak periodic signal accessible. Experiments have now reported quantum stochastic resonance, which arises from intrinsic quantum fluctuations rather than external noise.

    • Stefan Ludwig

  • Letter |

    A ‘which-way’ scattering process can generate entanglement between single photons and collective chiral vibrations in two-dimensional tungsten diselenide. The result opens up ways for engineering non-reciprocal interactions at the quantum level.

    • Xiaotong Chen
    • , Xin Lu
    •  & Ajit Srivastava

  • Letter |

    An excited two-level system emits a single photon, but in special circumstances it can emit two. The reason for this unexpected two-photon emission lies with modified Rabi oscillations.

    • Kevin A. Fischer
    • , Lukas Hanschke
    •  & Kai Müller

  • News & Views |

    A frequency comb technique used in NMR spectroscopy reveals the dynamics of the nuclear spin bath in self-assembled quantum dots.

    • Jeroen Elzerman
    •  & Mark Buitelaar

  • Editorial |

    Half a century on, the Kondo effect continues to inspire.

  • Article |

    Double quantum dots are proving themselves to be an excellent test bed for many-body physics. These artificial atoms now demonstrate a phenomenon in which the capacitive coupling between them causes the spin and charge degrees of freedom of the electrons in the system to become entangled—the so-called SU(4) Kondo effect.

    • A. J. Keller
    • , S. Amasha
    •  & D. Goldhaber-Gordon

  • Article |

    An electron and a hole trapped in the same quantum dot couple together to form an exciton. Conventionally the hole involved is a heavy hole. Light-hole excitons are now observed by applying elastic stress to initially unstrained gallium arsenide-based dots. The quasiparticles are identified by their optical emission signature, and could be used in future quantum technologies.

    • Y. H. Huo
    • , B. J. Witek
    •  & O. G. Schmidt

  • News & Views |

    Distinguishing between different sources of noise in quantum dots could help to develop single-photon devices that are suitable for long-range entanglement.

    • Hendrik Bluhm

  • Article |

    Charge noise and spin noise lead to decoherence of the state of a quantum dot. A fast spectroscopic technique based on resonance fluorescence can distinguish between these two deleterious effects, enabling a better understanding of how to minimize their influence.

    • Andreas V. Kuhlmann
    • , Julien Houel
    •  & Richard J. Warburton

  • News & Views |

    Spin coherence of valence holes in semiconductor quantum-dots is governed by interactions with the nuclear spins of the dot lattice. Experiments and theory have revealed an important new ingredient that determines the strength and sign of this coupling.

    • Bernhard Urbaszek

  • Letter |

    Quantum dots are a promising host for spin-based qubits. Whereas nuclear-field fluctuations adversely affect electron-spin coherence, the smaller hyperfine interaction between holes and nuclei makes holes a promising alternative. A sensitive measurement of the hyperfine constant of the holes in different quantum-dot material systems now demonstrates how this interaction can be tuned and perhaps further reduced.

    • E. A. Chekhovich
    • , M. M. Glazov
    •  & A. I. Tartakovskii

  • News & Views |

    In most electrical conductors, we expect charge and heat to be transported in the same direction. However, in certain two-dimensional electron systems, fractional quantum Hall states can cause charge and heat to flow in opposite directions.

    • Stefan Heun

  • Article |

    In most electrical conductors, heat is transported by charge carriers and so both usually flow in the same direction; but in two-dimensional electron systems subject to strong magnetic fields, certain fractional quantum Hall states can cause charge and heat to flow in opposite directions.

    • Vivek Venkatachalam
    • , Sean Hart
    •  & Amir Yacoby

  • News & Views |

    Single electrons in quantum dots can be disturbed by the apparatus used to measure them. The disturbance can be mediated by incoherent phonons — literally, noise. Engineering acoustic interference could negate these deleterious effects and bring quantum dots closer to becoming a robust quantum technology.

    • Thaddeus D. Ladd

  • Letter |

    You influence a system by measuring it. This back-action is an important consideration when studying tiny structures in which quantum effects play a crucial role. Researchers now show that quantum interference could provide a way to negate back-action in quantum-dot-qubit circuits.

    • G. Granger
    • , D. Taubert
    •  & A. S. Sachrajda

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