Quantum physics articles within Nature Physics

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  • Article |

    It has been suggested that Gaussian boson sampling may provide a quantum computational advantage for calculating the vibronic spectra of molecules. Now, an equally efficient classical algorithm has been identified.

    • Changhun Oh
    • , Youngrong Lim
    •  & Liang Jiang

  • Article |

    An error detecting code running on a trapped-ion quantum computer protects expressive circuits of eight logical qubits with a high-fidelity and partially fault-tolerant implementation of a universal gate set.

    • Chris N. Self
    • , Marcello Benedetti
    •  & David Amaro

  • Article |

    The Haldane model is a paradigmatic example of topological behaviour but has not previously been implemented in condensed-matter experiments. Now a moiré bilayer is shown to realize this model with the accompanying quantized transport response.

    • Wenjin Zhao
    • , Kaifei Kang
    •  & Kin Fai Mak

  • Comment |

    Quantum hypothesis testing—the task of distinguishing quantum states—enjoys surprisingly deep connections with the theory of entanglement. Recent findings have reopened the biggest questions in hypothesis testing and reversible entanglement manipulation.

    • Mario Berta
    • , Fernando G. S. L. Brandão
    •  & Marco Tomamichel

  • News & Views |

    Electrons trapped above the surface of solid neon can be used to create qubits using spatial states with different charge distributions. These charge qubits combine direct electric field control with long coherence times.

    • Atsushi Noguchi

  • Comment |

    Supersymmetric quantum field theories have special properties that make them easier to study. This Comment discusses how the constraints that supersymmetry places on renormalization group flows have been used to study strongly coupled field theories.

    • Jaewon Song

  • Research Briefing |

    Landau’s theory of Fermi liquids predicts that impurities embedded in a Fermi sea of atoms form quasiparticles called polarons that interact with one another via the surrounding medium. Such mediated polaron–polaron interactions have been directly observed and are shown to depend on the quantum statistics of the impurities.

  • News & Views |

    The simulation of open quantum many-body systems is one of the hardest tasks in computational physics. Now, quantum computers are close to answering crucial questions for such systems in a regime that classical computers cannot reach.

    • Hendrik Weimer

  • 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 |

    Errors in a quantum computer that are correlated between different qubits pose a considerable challenge for correction schemes. Measurements of noise in silicon spin qubits show that electric field fluctuations can create strongly correlated errors.

    • J. Yoneda
    • , J. S. Rojas-Arias
    •  & S. Tarucha

  • Article
    | Open Access

    Physical realizations of qubits are often vulnerable to leakage errors, where the system ends up outside the basis used to store quantum information. A leakage removal protocol can suppress the impact of leakage on quantum error-correcting codes.

    • Kevin C. Miao
    • , Matt McEwen
    •  & Yu Chen

  • Article |

    Quantum computers may help to solve classically intractable problems, such as simulating non-equilibrium dissipative quantum systems. The critical dynamics of a dissipative quantum model has now been probed on a trapped-ion quantum computer.

    • Eli Chertkov
    • , Zihan Cheng
    •  & Michael Foss-Feig

  • Article |

    The high inelastic loss rate in gases of bosonic molecules has so far hindered the stabilization needed to reach quantum degeneracy. Now, an experiment using microwave shielding demonstrates a large reduction of losses for bosonic dipolar molecules.

    • Niccolò Bigagli
    • , Claire Warner
    •  & Sebastian Will

  • 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

  • News & Views |

    Generating high harmonics or attosecond pulses of light is normally thought of as a classical process, but a theoretical study has now shown how the process could be driven by quantum light.

    • Dong Hyuk Ko
    •  & P. B. Corkum

  • Article |

    Being able to perform qubit measurements within a quantum circuit and adapt to their outcome broadens the power of quantum computers. These mid-circuit measurements have now been used to implement a cryptographic proof of non-classical behaviour.

    • Daiwei Zhu
    • , Gregory D. Kahanamoku-Meyer
    •  & Christopher Monroe

  • Article |

    Quantum computers are believed to exponentially outperform classical computers at some tasks, but it is hard to make guarantees about the limits of classical computers. It has now been proven that classical computers cannot efficiently simulate most quantum circuits.

    • Ramis Movassagh

  • News & Views |

    Exploring the combined effects of many-body interactions and topology is experimentally challenging. Now, researchers have shown that strong interparticle interactions force ultracold atoms to shift as a whole or one by one, or break quantization in a topological pump.

    • Yongguan Ke
    •  & Chaohong Lee

  • 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

  • Article |

    Many quantum devices operate in the microwave regime, but long-distance communication relies on optical photons. A nanomechanical resonator can be used to create entangled optical and microwave photons linking the two frequency regimes.

    • Wentao Jiang
    • , Felix M. Mayor
    •  & Amir H. Safavi-Naeini

  • Article |

    Some many-body problems are challenging to solve in real space, but have a convenient Fock-space representation. A superconducting qubit experiment now demonstrates the benefits of this approach for the study of quantum dynamics and criticality.

    • Yunyan Yao
    • , Liang Xiang
    •  & Qiujiang Guo

  • News & Views |

    In principle, quantum entanglement gives advantages in radar detection even under noisy and lossy operating conditions. More than a decade after the proposal, the predicted quantum advantage has finally been demonstrated at microwave frequencies.

    • Quntao Zhuang

  • Research Briefing |

    Most quantum processors rely on native interactions between pairs of qubits to generate quantum entangling gates. Now, by modulating the driving laser fields, gates that entangle a triplet or quartet of trapped-ion qubits have been realized, creating useful new components for quantum computing applications.

  • Article |

    Generation of entanglement in quantum computers stems from the native interactions between qubits, which are usually restricted to the pairwise limit. A method to control three- and four-body interactions has now been demonstrated with trapped ions.

    • Or Katz
    • , Lei Feng
    •  & Marko Cetina

  • Article |

    Proposals for quantum radars have suggested that in noisy environments there may be a benefit in sensing using quantum microwaves. A superconducting circuit experiment has now confirmed an advantage exists under appropriate conditions.

    • R. Assouly
    • , R. Dassonneville
    •  & B. Huard

  • Research Briefing |

    A coherent interface between a mechanical oscillator and superconducting electrical circuits would enable the control of quantum states of mechanical motion, but such interfaces often result in excess mechanical energy loss. A new material-agnostic approach is shown to achieve strong electromechanical coupling while preserving a long phonon lifetime.

  • News & Views |

    Two studies of electrons generated from laser-triggered emitters have found highly predictable electron–electron energy correlations. These studies, at vastly different energy scales, may lead to heralded electron sources, enabling quantum free-electron optics and low-noise, low-damage electron beam lithography and microscopy.

    • John W. Simonaitis
    •  & Phillip D. Keathley

  • Article
    | Open Access

    Coulomb interactions in free-electron beams are usually seen as an adverse effect. The creation of distinctive number states with one, two, three and four electrons now reveals unexpected opportunities for electron microscopy and lithography from Coulomb correlations.

    • Rudolf Haindl
    • , Armin Feist
    •  & Claus Ropers

  • Article |

    Electrical control of quantum mechanical oscillators is normally performed using piezoelectrics, but incorporating these additional materials can severely reduce performance. Electrostatic control has now been demonstrated in a silicon device.

    • Alkim Bozkurt
    • , Han Zhao
    •  & Mohammad Mirhosseini

  • News & Views |

    A real qubit is not an isolated unitary quantum system but is subject to noise from its environment. An experiment has now turned this interaction on its head, controlling the environment using the qubit itself.

    • Bayan Karimi
    •  & Jukka P. Pekola

  • News & Views |

    The interplay of quantum measurements and local interactions in many-body systems can lead to new out-of-equilibrium phase transitions. An experiment has now shown that quantum simulators can meet the challenge of detecting them.

    • Alessandro Romito

  • Article |

    The performance of superconducting qubits is often limited by spurious two-level systems. Now, a qubit operating as a heat engine manipulates its bath of nearby two-level systems, providing insights into their dynamics and interactions.

    • Martin Spiecker
    • , Patrick Paluch
    •  & Ioan M. Pop

  • Article |

    Some driven systems sustain non-equilibrium phases in which phase transitions occur without symmetry breaking. The use of a laser-cooled atomic cloud confined in a pencil beam now allows the demonstration of such a system.

    • Giovanni Ferioli
    • , Antoine Glicenstein
    •  & Antoine Browaeys

  • Article |

    Engineering the frequency spectrum of systems of multiple quantum emitters is the key for many quantum technologies. A cavity quantum electrodynamics experiment now demonstrates the real-time frequency modulation of cavity-protected polaritons.

    • Mohamed Baghdad
    • , Pierre-Antoine Bourdel
    •  & Romain Long

  • Article
    | Open Access

    Random spin models play a key role in our understanding of disorder and complex many-body systems. Two all-to-all interacting, disordered models have now been realized using a cavity quantum electrodynamics platform.

    • Nick Sauerwein
    • , Francesca Orsi
    •  & Jean-Philippe Brantut

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