Papers

Yuan-Yuan Zhao, Dong Liu·Jan 30, 2023

Abstract Quantum computers face significant challenges from quantum deviations or coherent noise, particularly during gate operations, which pose a complex threat to the efficacy of quantum error correction (QEC) protocols. Here we scrutinize the per...

Junpeng Zhan·Jan 30, 2023

Grover’s search algorithm is renowned for its dramatic speedup in solving many important scientific problems. The recently proposed Variational Quantum Search (VQS) algorithm has shown an exponential advantage over Grover’s algorithm for up to 26 qub...

Sebastian Brandhofer, Jinwoong Kim, Siyuan Niu +1 more·Jan 27, 2023

As the nascent field of quantum computing develops, an increasing number of quantum hardware modalities, such as superconducting electronic circuits, semiconducting spins, trapped ions, and neutral atoms, have become available for performing quantum ...

Andrew Litteken, L. M. Seifert, Jason Chadwick +3 more·Jan 27, 2023

Quantum computing is in an era of limited resources. Current hardware lacks high fidelity gates, long coherence times, and the number of computational units required to perform meaningful computation. Contemporary quantum devices typically use a bina...

B. Nikolov, E. Diamond-Hitchcock, J. Bass +2 more·Jan 25, 2023

Neutral atoms are a promising platform for scalable quantum computing, however, prior demonstration of high fidelity gates or low-loss readout methods have employed restricted numbers of qubits. Using randomized benchmarking of microwave-driven singl...

Sascha Heußen, L. Postler, M. Rispler +5 more·Jan 24, 2023

Fault-tolerant quantum error correction provides a strategy to protect information processed by a quantum computer against noise which would otherwise corrupt the data. A fault-tolerant universal quantum computer must implement a universal gate set o...

Raghav G. Jha·Jan 23, 2023

We discuss fundamentals of quantum computing and information - quantum gates, circuits, algorithms, theorems, error correction, and provide collection of QISKIT programs and exercises for the interested reader.

J. Ziegler, F. Luthi, Michael S. Ramsey +3 more·Jan 20, 2023

Gate-defined quantum dots (QDs) have appealing attributes as a quantum computing platform. However, near-term devices possess a range of possible imperfections that need to be accounted for during the tuning and operation of QD devices. One such prob...

Andrew K. Tan, Yuan Liu, Minh C. Tran +1 more·Jan 20, 2023

The intrinsic probabilistic nature of quantum systems makes error correction or mitigation indis-pensable for quantum computation. While current error-correcting strategies focus on correcting errors in quantum states or quantum gates, these fine-grai...

Pablo Antonio Moreno Casares·Jan 19, 2023

The framework of this thesis is fault-tolerant quantum algorithms. Grover's algorithm and quantum walks are described in Chapter 2. We start by highlighting the central role that rotations play in quantum algorithms, explaining Grover's, why it is op...

J. Balewski, Mercy G. Amankwah, R. Beeumen +3 more·Jan 19, 2023

Compact quantum data representations are essential to the emerging field of quantum algorithms for data analysis. We introduce two new data encoding schemes, QCrank and QBArt, which have a high degree of quantum parallelism through uniformly controll...

Chao Fang, Ye Wang, Ke-jia Sun +1 more·Jan 18, 2023

The universality theorem in quantum computing states that any quantum computational task can be decomposed into a finite set of logic gates operating on one and two qubits. However, the process of such decomposition is generally inefficient, often le...

Yu-Fang Chen, Kai-Min Chung, Ondřej Lengál +3 more·Jan 18, 2023

We introduce a new paradigm for analysing and finding bugs in quantum circuits. In our approach, the problem is given by a triple {P} C {Q} and the question is whether, given a set P of quantum states on the input of a circuit C, the set of quantum s...

M. Znidaric·Jan 16, 2023

We want to understand how relaxation process from an initial non-generic state proceeds towards a long-time typical state reached under unitary quantum evolution. One would expect that after some initial correlation time relaxation will be a simple e...

Waldemir Cambiucci, Regina Silveira, W. Ruggiero·Jan 13, 2023

When dealing with NISQ computers (Noise Intermediate Scale Quantum), it is widely accepted that distributing circuits among processing agents is an effective way to increase scalability with small machines. This approach can improve overall computati...

Fabio Zoratti, Giacomo De Palma, B. Kiani +4 more·Jan 12, 2023

We consider the problem of devising a suitable Quantum Error Correction (QEC) procedures for a generic quantum noise acting on a quantum circuit. In general, there is no analytic universal procedure to obtain the encoding and correction unitary gates...

M. Mazzanti, R. Gerritsma, R. Spreeuw +1 more·Jan 11, 2023

We consider the implementation of quantum logic gates in trapped ions using tightly focused optical tweezers. Strong polarization gradients near the tweezer focus lead to qubit-state dependent forces on the ion. We show that these may be used to impl...

Kevin Mato, M. Ringbauer, S. Hillmich +1 more·Jan 10, 2023

Most quantum computing architectures to date natively support multi-valued logic, albeit being typically operated in a binary fash-ion. Multi-valued, or qudit, quantum processors have access to much richer forms of quantum entanglement, which promise...

Nora Bauer, Elias Kokkas, Victor Ale +1 more·Jan 10, 2023

We study the emergence of topological matter in two-dimensional systems of neutral Rydberg atoms in Ruby lattices. While Abelian anyons have been predicted in such systems, non-Abelian anyons, which would form a substrate for fault-tolerant quantum c...

Yanwu Gu, Wei-Feng Zhuang, Xudan Chai +1 more·Jan 5, 2023

Noise remains the major obstacle to scalable quantum computation. Quantum benchmarking provides key information on noise properties and is an important step for developing more advanced quantum processors. However, current benchmarking methods are ei...