Quantum mechanics articles within Nature Physics

Featured

  • Article |

    The sign of the Casimir force depends on the electric permittivities and the magnetic permeabilities of the materials involved. For a gold sphere immersed in a ferrofluid, tuneability of the Casimir force by means of a magnetic field is now shown.

    • Yichi Zhang
    • , Hui Zhang
    •  & Changgan Zeng

  • News & Views |

    Questioning the validity of axioms can teach us about physics beyond the standard model. A recent search for the violation of charge conservation and the Pauli exclusion principle yields limits on these scenarios.

    • Alessio Porcelli

  • 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

  • News & Views |

    Some quantum acoustic resonators possess a large number of phonon modes at different frequencies. Direct interactions between modes similar to those available for photonic devices have now been demonstrated. This enables manipulation of multimode states.

    • Audrey Bienfait

  • Article
    | Open Access

    Quantum gates require controlled interactions between different degrees of freedom. A tunable coupling has now been demonstrated between the phonon modes of a mechanical resonator designed for storing and manipulating quantum information.

    • Uwe von Lüpke
    • , Ines C. Rodrigues
    •  & Yiwen Chu

  • Article
    | Open Access

    External driving of qubits can exploit their nonlinearity to generate different forms of interqubit interactions, broadening the capabilities of the platform.

    • Long B. Nguyen
    • , Yosep Kim
    •  & Irfan Siddiqi

  • News & Views |

    A milestone for the coherence time of a macroscopic mechanical oscillator may be a crucial advance for enabling the development of quantum technologies based on optomechanical architectures and for fundamental tests of quantum mechanics.

    • A. Metelmann

  • 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 |

    The study and control of chemical reactions between atoms and molecules at quantum degeneracy is an outstanding problem in quantum chemistry. An experiment now reports the coherent and collective reactions of atomic and molecular Bose–Einstein condensates.

    • Zhendong Zhang
    • , Shu Nagata
    •  & Cheng Chin

  • Letter |

    Quantum systems produce correlations that cannot be mimicked by classical resources, which can be used to certify quantum states without trusting the underlying devices. A network can perform this procedure for pure states with any number of systems.

    • Ivan Šupić
    • , Joseph Bowles
    •  & Matty J. Hoban

  • News & Views |

    Reconstructing the motional quantum states of massive particles has important implications for quantum information science. Motional tomography of a single atom in an optical tweezer has now been demonstrated.

    • Hannes Bernien

  • Article |

    A tomography protocol that exploits the control offered by optical tweezers allows the reconstruction of motional states of a single trapped atom. This has implications for the study of non-classical states of massive trapped and levitated particles.

    • M. O. Brown
    • , S. R. Muleady
    •  & C. A. Regal

  • 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

  • Article |

    In bosonic systems, the presence of particles in a given quantum level can enhance the transition rates into that state, an effect known as bosonic stimulation. Bosonic enhancement of light scattering has now been observed in an ultracold Bose gas.

    • Yu-Kun Lu
    • , Yair Margalit
    •  & Wolfgang Ketterle

  • 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.

  • Editorial |

    It is easy to dismiss research into the foundations of quantum mechanics as irrelevant to physicists in other areas. Adopting this attitude misses opportunities to appreciate the richness of quantum mechanics.

  • Letter |

    A method to engineer higher-order interactions between photons provides a route to create non-classical and entangled states across multiple modes.

    • Srivatsan Chakram
    • , Kevin He
    •  & David I. Schuster

  • News & Views |

    Quantum waves can have stronger correlations than classical ones because of their particle nature. This effect has now been observed using quantum sound waves travelling in an acoustic waveguide.

    • H. Yamaguchi
    •  & D. Hatanaka

  • News & Views |

    The physics of large systems is often understood as the outcome of the local operations among its components. Now, it is shown that this picture may be incomplete in quantum systems whose interactions are constrained by symmetries.

    • Álvaro M. Alhambra

  • 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 |

    Polaritons are hybrid states of light and matter that occur in a wide range of physical platforms. When a nanosphere is levitated inside an optical cavity, light can hybridize with the motion on a plane rather than along an axis, resulting in ‘vectorial’ polaritons.

    • Tania S. Monteiro

  • Article |

    Entanglement is central to theories of quantum many-body systems but is very resource intensive to measure. A protocol based on a quasilocal parametrization of physical states allows entanglement structures to be studied using very few measurements.

    • Christian Kokail
    • , Rick van Bijnen
    •  & Peter Zoller

  • News & Views |

    Measuring a quantum state often enough can leave you with a completely different phase of matter. Mix in competing measurements and you may find yourself with an entire phase diagram of dynamical quantum states and transitions.

    • Brayden Ware
    •  & Romain Vasseur

  • Measure for Measure |

    Within the Hartree atomic unit systems, the Schrödinger equation becomes parameter free. But there’s more to it than making a student’s life easier, as Gordon Drake and Eite Tiesinga recount.

    • Gordon W. F. Drake
    •  & Eite Tiesinga

  • 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

  • Article |

    A weak-to-strong quantum measurement transition has been observed in a single-trapped-ion system, where the ion’s internal electronic state and its vibrational motion play the roles of the measured system and the measuring pointer.

    • Yiming Pan
    • , Jie Zhang
    •  & Nir Davidson

  • News & Views |

    Although quantum mechanics is essential to understand microscopic systems, it has little effect on heavier objects. Experiments have now put strict constraints on theories that use gravity to explain the absence of large-scale quantum effects.

    • M. S. Kim

  • Article |

    The radiation emission rate from gravity-related wave function collapse is calculated and the results of a dedicated experiment at the Gran Sasso laboratory are reported, ruling out the natural parameter-free version of the Diósi–Penrose model.

    • Sandro Donadi
    • , Kristian Piscicchia
    •  & Angelo Bassi

  • Measure for Measure |

    Wolfgang Pauli introduced the Bohr magneton as a fundamental unit of magnetic moment during an effort to find a quantum basis for magnetism, as Davide Castelvecchi recounts.

    • Davide Castelvecchi

  • News & Views |

    The discussion of the quantum mechanical Wigner’s friend thought experiment has regained intensity. Recent theoretical results and experimental tests restrict the possibility of maintaining an observer-independent notion of measurement outcomes.

    • Časlav Brukner

  • Letter |

    A protocol for the reliable, efficient and precise characterization of quantum noise is reported and implemented in an architecture consisting of 14 superconducting qubits. Correlated noise within arbitrary sets of qubits can be easily detected.

    • Robin Harper
    • , Steven T. Flammia
    •  & Joel J. Wallman

  • News & Views |

    A mooted advantage of high-dimensional states is their robustness to noise, yet their fragility in noisy channels has hindered their deployment. A demonstration shows how to exploit entanglement to restore quantum correlations lost in transmission.

    • Andrew Forbes
    •  & Isaac Nape

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