Quantum information articles within Nature Physics

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  • Review Article |

    The study of quantum systems in a programmable and controllable fashion is one of the aims of both quantum simulation and computing. This Review covers the prospects and opportunities that ultracold molecules offer in these fields.

    • Simon L. Cornish
    • , Michael R. Tarbutt
    •  & Kaden R. A. Hazzard

  • Article |

    Many recent experiments have stored quantum information in bosonic modes, such as photons in resonators or optical fibres. Now an adaptation of the classical spherical codes provides a framework for designing quantum error correcting codes for these platforms.

    • Shubham P. Jain
    • , Joseph T. Iosue
    •  & Victor V. Albert

  • 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

  • Research Briefing |

    A practical and hardware-efficient blueprint for fault-tolerant quantum computing has been developed, using quantum low-density-parity-check codes and reconfigurable neutral-atom arrays. The scheme requires ten times fewer qubits and paves the way towards large-scale quantum computing using existing experimental technologies.

  • Comment |

    The time has come to consider appropriate guardrails to ensure quantum technology benefits humanity and the planet. With quantum development still in flux, the science community shares a responsibility in defining principles and practices.

    • Urs Gasser
    • , Eline De Jong
    •  & Mauritz Kop

  • News & Views |

    The Hamiltonian describing a quantum many-body system can be learned using measurements in thermal equilibrium. Now, a learning algorithm applicable to many natural systems has been found that requires exponentially fewer measurements than existing methods.

    • Sitan Chen

  • Article |

    Despite being essential to many applications in quantum science, entanglement can be easily disrupted by decoherence. A protocol based on repetitive quantum error correction now demonstrates enhanced coherence times of entangled logical qubits.

    • Weizhou Cai
    • , Xianghao Mu
    •  & Luyan Sun

  • Article
    | Open Access

    Photon-mediated entanglement in atomic ensembles coupled to cavities enables the engineering of quantum states with a graph-like entanglement structure. This offers potential advantages in quantum computation and metrology.

    • Eric S. Cooper
    • , Philipp Kunkel
    •  & Monika Schleier-Smith

  • 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 |

    The kernel method in machine learning can be implemented on near-term quantum computers. A 27-qubit device has now been used to solve learning problems using kernels that have the potential to be practically useful.

    • Jennifer R. Glick
    • , Tanvi P. Gujarati
    •  & Kristan Temme

  • News & Views |

    Scalable quantum computers require quantum error-correcting codes that can robustly store information. Exploiting the structure of well-known classical codes may help create more efficient approaches to quantum error correction.

    • Anirudh Krishna

  • Article
    | Open Access

    Large quantum computers will require error correcting codes, but most proposals have prohibitive requirements for overheads in the number of qubits, processing time or both. A way to combine smaller codes now gives a much more efficient protocol.

    • Hayata Yamasaki
    •  & Masato Koashi

  • 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

  • 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

  • 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 |

    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 |

    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

  • 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

  • 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 |

    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

  • News & Views |

    A quantum engineering technique powered by disorder offers access to local correlation functions down to single-site resolution in nuclear spin ensembles, allowing the study of both spin and energy hydrodynamics.

    • Yaoming Chu
    •  & Jianming Cai

  • Research Briefing |

    It’s a long-standing theoretical prediction that mutual information in locally interacting, many-body quantum systems follows an area law. Using cold-atom quantum-field simulators on an atom chip to measure the scaling of von Neumann entropy and mutual information, that prediction is now proved true.

  • Article |

    The scaling of entanglement entropy and mutual information is key for the understanding of correlated states of matter. An experiment now reports the measurement of von Neumann entropy and mutual information in a quantum field simulator.

    • Mohammadamin Tajik
    • , Ivan Kukuljan
    •  & Jörg Schmiedmayer

  • News & Views |

    The study of complexity of unitary transformations has become central to quantum information theory and, increasingly, quantum field theory and quantum gravity. A proof of how complexity grows with system size demonstrates the power of a geometric approach.

    • Michal P. Heller

  • News & Views |

    Boson sampling is a benchmark problem for photonic quantum computers and a potential avenue towards quantum advantage. A scheme to realize a boson sampler based on the vibrational modes in a chain of trapped ions instead has now been demonstrated.

    • Norbert M. Linke

  • Article |

    The scalability of quantum information processing applications is generally hindered by loss and inefficient preparation and detection. A minimal loss network based on phonons has now been realized with trapped ions.

    • Wentao Chen
    • , Yao Lu
    •  & Kihwan Kim

  • 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 |

    ‘Squeezing’ of light can be used to alter the distribution of quantum noise to benefit quantum sensing and other applications. An improved design for a microwave photon squeezer provides high performance over a large bandwidth.

    • Baleegh Abdo

  • 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

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