Quantum

Paper

Post-selection-free preparation of high-quality physical qubits

Ben Barber, Neil I. Gillespie, and J. M. Taylor,

Quantum 7, 994 (2023).

Rapidly improving gate fidelities for coherent operations mean that errors in state preparation and measurement (SPAM) may become a dominant source of error for fault-tolerant operation of q…

Paper

Efficient variational synthesis of quantum circuits with coherent multi-start optimization

Nikita A. Nemkov, Evgeniy O. Kiktenko, Ilia A. Luchnikov, and Aleksey K. Fedorov,

Quantum 7, 993 (2023).

We consider the problem of the variational quantum circuit synthesis into a gate set consisting of the CNOT gate and arbitrary single-qubit (1q) gates with the primary target being the minim…

Paper

Near-deterministic hybrid generation of arbitrary photonic graph states using a single quantum emitter and linear optics

Paul Hilaire, Leonid Vidro, Hagai S. Eisenberg, and Sophia E. Economou,

Quantum 7, 992 (2023).

Since linear-optical two-photon gates are inherently probabilistic, measurement-based implementations are particularly well suited for photonic platforms: a large highly-entangled photonic r…

Paper

Hidden Quantum Memory: Is Memory There When Somebody Looks?

Philip Taranto, Thomas J. Elliott, and Simon Milz,

Quantum 7, 991 (2023).

In classical physics, memoryless dynamics and Markovian statistics are one and the same. This is not true for quantum dynamics, first and foremost because quantum measurements are invasive.…

Paper

State retrieval beyond Bayes’ retrodiction

Jacopo Surace and Matteo Scandi,

Quantum 7, 990 (2023).

In the context of irreversible dynamics, associating to a physical process its intuitive reverse can result to be a quite ambiguous task. It is a standard choice to define the reverse proces…

Paper

Quantum Lazy Training

Erfan Abedi, Salman Beigi, and Leila Taghavi,

Quantum 7, 989 (2023).

In the training of over-parameterized model functions via gradient descent, sometimes the parameters do not change significantly and remain close to their initial values. This phenomenon is…

Paper

Quantum Regularized Least Squares

Shantanav Chakraborty, Aditya Morolia, and Anurudh Peduri,

Quantum 7, 988 (2023).

Linear regression is a widely used technique to fit linear models and finds widespread applications across different areas such as machine learning and statistics. In most real-world scenari…

Paper

Robust measurement of wave function topology on NISQ quantum computers

Xiao Xiao, J. K. Freericks, and A. F. Kemper,

Quantum 7, 987 (2023).

Topological quantum phases of quantum materials are defined through their topological invariants. These topological invariants are quantities that characterize the global geometrical propert…

Paper

Operational interpretation of the vacuum and process matrices for identical particles

Ricardo Faleiro, Nikola Paunkovic, and Marko Vojinovic,

Quantum 7, 986 (2023).

This work overviews the single-particle two-way communication protocol recently introduced by del Santo and Dakić (dSD), and analyses it using the process matrix formalism. We give a detaile…

Paper

Finite-rate sparse quantum codes aplenty

Maxime Tremblay, Guillaume Duclos-Cianci, and Stefanos Kourtis,

Quantum 7, 985 (2023).

We introduce a methodology for generating random multi-qubit stabilizer codes based on solving a constraint satisfaction problem (CSP) on random bipartite graphs. This framework allows us to…

Paper

Synthesis of and compilation with time-optimal multi-qubit gates

Pascal Baßler, Matthias Zipper, Christopher Cedzich, Markus Heinrich, Patrick H. Huber, Michael Johanning, and Martin Kliesch,

Quantum 7, 984 (2023).

We develop a method to synthesize a class of entangling multi-qubit gates for a quantum computing platform with fixed Ising-type interaction with all-to-all connectivity. The only requiremen…

Paper

Matrix concentration inequalities and efficiency of random universal sets of quantum gates

Piotr Dulian and Adam Sawicki,

Quantum 7, 983 (2023).

For a random set $\mathcal{S} \subset U(d)$ of quantum gates we provide bounds on the probability that $\mathcal{S}$ forms a $\delta$-approximate $t$-design. In particular we have found that for…

Paper

Signature of exceptional point phase transition in Hermitian systems

T. T. Sergeev, A. A. Zyablovsky, E. S. Andrianov, and Yu. E. Lozovik,

Quantum 7, 982 (2023).

Exceptional point (EP) is a spectral singularity in non-Hermitian systems. The passing over the EP leads to a phase transition, which endows the system with unconventional features that find…

Paper

Quantum Phase Recognition via Quantum Kernel Methods

Yusen Wu, Bujiao Wu, Jingbo Wang, and Xiao Yuan,

Quantum 7, 981 (2023).

The application of quantum computation to accelerate machine learning algorithms is one of the most promising areas of research in quantum algorithms. In this paper, we explore the power of…

Paper

Boosting device-independent cryptography with tripartite nonlocality

Federico Grasselli, Gláucia Murta, Hermann Kampermann, and Dagmar Bruß,

Quantum 7, 980 (2023).

Device-independent (DI) protocols, such as DI conference key agreement (DICKA) and DI randomness expansion (DIRE), certify private randomness by observing nonlocal correlations when two or m…

Paper

The role of cohomology in quantum computation with magic states

Robert Raussendorf, Cihan Okay, Michael Zurel, and Polina Feldmann,

Quantum 7, 979 (2023).

A web of cohomological facts relates quantum error correction, measurement-based quantum computation, symmetry protected topological order and contextuality. Here we extend this web to quant…

Category: Paper