Significant efforts have been dedicated to mitigate gate errors in quantum devices, while comparatively little attention has been given to the increasing issue of readout errors. The authors present an explicit protocol for comprehensive readout error mitigation with quantum state tomography, and demonstrate its applicability experimentally on a superconducting qubit device.
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# Quantum information articles from across Nature Portfolio

Definition

Quantum information is problem solving and data processing using a quantum system as the information carrier, rather than binary ‘1’s and ‘0’s used in conventional computation. Quantum information systems could be able to transmit data that is fundamentally secure and solve problems that are beyond the power of modern computers.

## Featured

- 

### Tuning electronic circuits close to absolute zero using quantum paraelectric varactors

Radiofrequency tuning elements made of quantum paraelectric materials are demonstrated at temperatures close to absolute zero — a temperature regime in which conventional electronic tuning components do not work. This advance greatly improves the read-out sensitivity of quantum circuits that require operation at such low temperatures.

P: 1-2

- 

### Photon losses create tension for Gaussian boson sampling

Recent experimental claims of quantum advantage rely on the absence of classical algorithms that can reproduce the results. A tensor network algorithm can now challenge recent optical quantum advantage experiments.

- Jordi Tura

P: 1-2

## Latest Research and Reviews

- 

### Hamiltonian dynamics on digital quantum computers without discretization error

- Etienne Granet
- Henrik Dreyer

Volume: 10, P: 82

- 

### Readout error mitigated quantum state tomography tested on superconducting qubits

Significant efforts have been dedicated to mitigate gate errors in quantum devices, while comparatively little attention has been given to the increasing issue of readout errors. The authors present an explicit protocol for comprehensive readout error mitigation with quantum state tomography, and demonstrate its applicability experimentally on a superconducting qubit device.

- Adrian Skasberg Aasen
- Andras Di Giovanni
- Martin Gärttner

Volume: 7, P: 301

- 

### Deterministic photon source of genuine three-qubit entanglement

Entanglement between single photons and solid-state emitters is a key component for photonic quantum computing and networks. Here, using a single electron spin in a quantum dot, the authors present a deterministic photon source achieving three-qubit entanglement of one electron spin and two photons.

- Yijian Meng
- Ming Lai Chan
- Peter Lodahl

Volume: 15, P: 7774

- 

### Efficient learning of ground and thermal states within phases of matter

Scalable characterisation of quantum states can be achieved by leveraging on simplifications valid for specific classes of states. Here, the authors show how to combine the strengths of shadows and many-body tomography for all states exhibiting exponential decay of correlations and the approximate Markov property.

- Cambyse Rouzé
- Daniel Stilck França
- James D. Watson

Volume: 15, P: 7755

- 

### Non-reciprocity in photon polarization based on direction of polarizer under gravitational fields

- Hansol Noh
- Paul M. Alsing
- Doyeol Ahn

Volume: 14, P: 20801

- 

### Engineered dissipation to mitigate barren plateaus

- Antonio Sannia
- Francesco Tacchino
- Roberta Zambrini

Volume: 10, P: 81

## News and Comment

- 

### Tuning electronic circuits close to absolute zero using quantum paraelectric varactors

Radiofrequency tuning elements made of quantum paraelectric materials are demonstrated at temperatures close to absolute zero — a temperature regime in which conventional electronic tuning components do not work. This advance greatly improves the read-out sensitivity of quantum circuits that require operation at such low temperatures.

P: 1-2

- 

### Photon losses create tension for Gaussian boson sampling

Recent experimental claims of quantum advantage rely on the absence of classical algorithms that can reproduce the results. A tensor network algorithm can now challenge recent optical quantum advantage experiments.

- Jordi Tura

P: 1-2

- 

### Scalable spin squeezing with local interactions

Spin-squeezed states are a resource for quantum-enhanced precision measurement. However, the theoretical foundations for scalable spin squeezing — where quantum enhancement grows with system size — have only been established for systems exhibiting all-to-all interactions. Now, by unveiling a connection to finite-temperature magnetism, scalable squeezing is extended to locally interacting systems.

P: 1-2

- 

### Precise control and non-destructive readout of quantum states of ion motion

A quantum control technique is used to directly couple trapped-ion motional modes with high fidelity, enabling non-destructive measurements of the quantum harmonic oscillator states of atomic motion. The strong coupling rate and precise manipulation of the quantum states achieved with this technique could lead to advances in quantum information processing.

P: 1-2

- 

### Anyons go universal

Topological quantum computers are predicted to perform calculations by manipulating quasiparticles known as non-Abelian anyons. A type of non-Abelian anyon that supports universal quantum gates has now been simulated using superconducting qubits.

- Trond I. Andersen
- Xiao Mi

P: 1-2

- 

### Ultracold molecules that interact from afar form elusive quantum state

A gas of molecules that interact over long distances has been cooled to mere nanokelvins, resulting in the emergence of a state known as a Bose–Einstein condensate — the first of its kind in this type of molecular system.

- Lauriane Chomaz

News & Views09 Jul 2024Nature

Volume: 631, P: 283-284

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