Quantum

Paper

A coherence-witnessing game and applications to semi-device-independent quantum key distribution

Mário Silva, Ricardo Faleiro, Paulo Mateus, and Emmanuel Zambrini Cruzeiro,

Quantum 7, 1090 (2023).

Semi-device-independent quantum key distribution aims to achieve a balance between the highest level of security, device independence, and experimental feasibility. Semi-quantum key distribu…

Paper

Concatenation Schemes for Topological Fault-tolerant Quantum Error Correction

Zhaoyi Li, Isaac Kim, and Patrick Hayden,

Quantum 7, 1089 (2023).

We investigate a family of fault-tolerant quantum error correction schemes based on the concatenation of small error detection or error correction codes with the three-dimensional cluster st…

Paper

Switching quantum reference frames in the N-body problem and the absence of global relational perspectives

Augustin Vanrietvelde, Philipp A. Höhn, and Flaminia Giacomini,

Quantum 7, 1088 (2023).

Given the importance of quantum reference frames (QRFs) to both quantum and gravitational physics, it is pertinent to develop a systematic method for switching between the descriptions of ph…

Paper

A Converse for Fault-tolerant Quantum Computation

Uthirakalyani G, Anuj K. Nayak, and Avhishek Chatterjee,

Quantum 7, 1087 (2023).

As techniques for fault-tolerant quantum computation keep improving, it is natural to ask: what is the fundamental lower bound on space overhead? In this paper, we obtain a lower bound on th…

Paper

Assessment of various Hamiltonian partitionings for the electronic structure problem on a quantum computer using the Trotter approximation

Luis A. Martínez-Martínez, Tzu-Ching Yen, and Artur F. Izmaylov,

Quantum 7, 1086 (2023).

Solving the electronic structure problem via unitary evolution of the electronic Hamiltonian is one of the promising applications of digital quantum computers. One of the practical strategie…

Paper

How to perform the coherent measurement of a curved phase space by continuous isotropic measurement. I. Spin and the Kraus-operator geometry of $\mathrm{SL}(2,\mathbb{C})$

Christopher S. Jackson and Carlton M. Caves,

Quantum 7, 1085 (2023).

The generalized $Q$-function of a spin system can be considered the outcome probability distribution of a state subjected to a measurement represented by the spin-coherent-state (SCS) positive…

Paper

Nearly-frustration-free ground state preparation

Matthew Thibodeau and Bryan K. Clark,

Quantum 7, 1084 (2023).

Solving for quantum ground states is important for understanding the properties of quantum many-body systems, and quantum computers are potentially well-suited for solving for quantum ground…

Paper

Thermal Area Law for Lattice Bosons

Marius Lemm and Oliver Siebert,

Quantum 7, 1083 (2023).

A physical system is said to satisfy a thermal area law if the mutual information between two adjacent regions in the Gibbs state is controlled by the area of their boundary. Lattice bosons…

Paper

Optimal encoding of oscillators into more oscillators

Jing Wu, Anthony J. Brady, and Quntao Zhuang,

Quantum 7, 1082 (2023).

Bosonic encoding of quantum information into harmonic oscillators is a hardware efficient approach to battle noise. In this regard, oscillator-to-oscillator codes not only provide an additio…

Paper

Optimizing sparse fermionic Hamiltonians

Yaroslav Herasymenko, Maarten Stroeks, Jonas Helsen, and Barbara Terhal,

Quantum 7, 1081 (2023).

We consider the problem of approximating the ground state energy of a fermionic Hamiltonian using a Gaussian state. In sharp contrast to the dense case [1, 2], we prove that strictly $q$-local…

Paper

Correlations constrained by composite measurements

John H. Selby, Ana Belén Sainz, Victor Magron, Łukasz Czekaj, and Michał Horodecki,

Quantum 7, 1080 (2023).

How to understand the set of correlations admissible in nature is one outstanding open problem in the core of the foundations of quantum theory. Here we take a complementary viewpoint to the…

Paper

Code-routing: a new attack on position verification

Joy Cree and Alex May,

Quantum 7, 1079 (2023).

The cryptographic task of position verification attempts to verify one party's location in spacetime by exploiting constraints on quantum information and relativistic causality. A popular ve…

Paper

High Dimensional Quantum Machine Learning With Small Quantum Computers

Simon C. Marshall, Casper Gyurik, and Vedran Dunjko,

Quantum 7, 1078 (2023).

Quantum computers hold great promise to enhance machine learning, but their current qubit counts restrict the realisation of this promise. To deal with this limitation the community has prod…

Paper

Identifying Pauli spin blockade using deep learning

Jonas Schuff, Dominic T. Lennon, Simon Geyer, David L. Craig, Federico Fedele, Florian Vigneau, Leon C. Camenzind, Andreas V. Kuhlmann, G. Andrew D. Briggs, Dominik M. Zumbühl, Dino Sejdinovic, and Natalia Ares,

Quantum 7, 1077 (2023).

Pauli spin blockade (PSB) can be employed as a great resource for spin qubit initialisation and readout even at elevated temperatures but it can be difficult to identify. We present a machin…

Paper

Classical models may be a better explanation of the Jiuzhang 1.0 Gaussian Boson Sampler than its targeted squeezed light model

Javier Martínez-Cifuentes, K. M. Fonseca-Romero, and Nicolás Quesada,

Quantum 7, 1076 (2023).

Recently, Zhong et al. [1, 2] performed landmark Gaussian boson sampling experiments with up to 144 modes using threshold detectors. The authors claim to have achieved quantum computational…

Paper

Adaptive syndrome measurements for Shor-style error correction

Theerapat Tansuwannont, Balint Pato, and Kenneth R. Brown,

Quantum 7, 1075 (2023).

The Shor fault-tolerant error correction (FTEC) scheme uses transversal gates and ancilla qubits prepared in the cat state in syndrome extraction circuits to prevent propagation of errors ca…

Category: Paper