Papers

J. Doi, H. Horii, Christopher Wood·Aug 7, 2023

Quantum computers are becoming practical for computing numerous applications. However, simulating quantum computing on classical computers is still demanding yet useful because current quantum computers are limited because of computer resources, hard...

Theodoros Trochatos, Chuan Xu, S. Deshpande +3 more·Aug 7, 2023

The cloud-based environments in which today's and future quantum computers will operate, raise concerns about the security and privacy of user's intellectual property. Quantum circuits submitted to cloud-based quantum computer providers represent sen...

Duc-Tuan Hoang, F. Metz, Andreas Thomasen +3 more·Aug 7, 2023

Quantum batteries are predicted to have the potential to outperform their classical counterparts and are therefore an important element in the development of quantum technologies. Of particular interest is the role of correlations in many-body quantu...

Etienne Granet, Henrik Dreyer·Aug 7, 2023

We introduce an algorithm to compute expectation values of time-evolved observables on digital quantum computers that requires only bounded average circuit depth to reach arbitrary precision, i.e. produces an unbiased estimator with finite average de...

Alonso Viladomat Jasso, Ark Modi, R. Ferrara +4 more·Aug 7, 2023

Nearest-neighbour clustering is a simple yet powerful machine learning algorithm that finds natural application in the decoding of signals in classical optical-fibre communication systems. Quantum k-means clustering promises a speed-up over the class...

Jesús Cobos, David F. Locher, A. Bermudez +2 more·Aug 7, 2023

We propose a novel variational ansatz for the ground-state preparation of the Z2 lattice gauge theory (LGT) in quantum simulators. It combines dissipative and unitary operations in a completely deterministic scheme with a circuit depth that does not ...

H. Liao, Kang L. Wang, Zongzheng Zhou +2 more·Aug 6, 2023

We perform classical simulations of the 127-qubit kicked Ising model, which was recently emulated using a quantum circuit with error mitigation [Nature 618, 500 (2023)]. Our approach is based on the projected entangled pair operator (PEPO) in the Hei...

Xinyu Fei, L. Brady, Jeffrey Larson +2 more·Aug 6, 2023

Quantum optimal control is a technique for controlling the evolution of a quantum system and has been applied to a wide range of problems in quantum physics. We study a binary quantum control optimization problem, where control decisions are binary-v...

Avimita Chatterjee, Subrata Das, Swaroop Ghosh·Aug 5, 2023

Quantum error correction codes (QECCs) are essential for reliable quantum computing as they protect quantum states against noise and errors. Limited research has explored the resilience of QECCs to biased noise, critical for selecting optimal codes. ...

Anthony J. Brady, A. Eickbusch, Shraddha Singh +2 more·Aug 5, 2023

Encoding quantum information into a set of harmonic oscillators is considered a hardware efficient approach to mitigate noise for reliable quantum information processing. Various codes have been proposed to encode a qubit into an oscillator -- includ...

Sutapa Samanta, Derek S. Wang, Armin Rahmani +1 more·Aug 4, 2023

Investigating the interplay of dualities, generalized symmetries, and topological defects beyond theoretical models is an important challenge in condensed matter physics and quantum materials. A simple model exhibiting this physics is the transverse-...

P. Klimov, A. Bengtsson, C. Quintana +21 more·Aug 4, 2023

A foundational assumption of quantum error correction theory is that quantum gates can be scaled to large processors without exceeding the error-threshold for fault tolerance. Two major challenges that could become fundamental roadblocks are manufact...

Terence Blésin, Wil Kao, A. Siddharth +5 more·Aug 4, 2023

Coherent interconversion between microwave and optical frequencies can serve as both classical and quantum interfaces for computing, communication, and sensing. Here, we present a compact microwave-optical transducer based on monolithic integration o...

V. Cimini, M. Valeri, S. Piacentini +5 more·Aug 4, 2023

Variational quantum metrology represents a powerful tool to optimize estimation strategies, resulting particularly beneficial for multiparameter estimation problems that often suffer from limitations due to the curse of dimensionality and computation...

Floor van Riggelen-Doelman, Chien-An Wang, S. L. de Snoo +7 more·Aug 4, 2023

Quantum links can interconnect qubit registers and are therefore essential in networked quantum computing. Semiconductor quantum dot qubits have seen significant progress in the high-fidelity operation of small qubit registers but establishing a comp...

Aaron Sidford, Chenyi Zhang·Aug 3, 2023

We consider the problem of minimizing a continuous function given quantum access to a stochastic gradient oracle. We provide two new methods for the special case of minimizing a Lipschitz convex function. Each method obtains a dimension versus accura...

G. Biswas, Shao-Hua Hu, Jun-Yi Wu +2 more·Aug 3, 2023

We investigate the fidelity of Haar random bipartite pure states from a fixed reference quantum state and their bipartite entanglement. By plotting the fidelity and entanglement on perpendicular axes, we observe that the resulting plots exhibit non-u...

Junjie Chen, Yuxuan Yan, You Zhou·Aug 3, 2023

Magic, or nonstabilizerness, characterizes the deviation of a quantum state from the set of stabilizer states, playing a fundamental role in quantum state complexity and universal fault-tolerant quantum computing. However, analytical and numerical ch...

Junxu Li, Xingyu Gao, M. Sajjan +3 more·Aug 3, 2023

Accurate electronic structure calculations might be one of the most anticipated applications of quantum computing.The recent landscape of quantum simulations within the Hartree-Fock approximation raises the prospect of substantial theory and hardware...

Liran Shirizly, G. Misguich, H. Landa·Aug 3, 2023

We study experimentally and numerically the noisy evolution of multipartite entangled states, focusing on superconducting qubit devices accessible via the cloud. We find that a valid modeling of the dynamics requires one to properly account for coher...