Papers

Tefjol Pllaha, Kalle Volanto, O. Tirkkonen·Feb 5, 2021

In fault-tolerant quantum computation and quan-tum error-correction one is interested on Pauli matrices that commute with a circuit/unitary. This information is encoded by the support (Pllaha et al., 2020) of the given circuit/unitary. We provide a f...

S. Daiss, S. Langenfeld, S. Welte +5 more·Feb 5, 2021

Quantum gating at a distance The processing of quantum information is reliant on the encoding and manipulation of quantum states of a qubit. Superconducting circuits are the most advanced platform at present, but there is an issue with cross-talk bet...

G. Moody, V. Sorger, P. Juodawlkis +47 more·Feb 5, 2021

Integrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of qubits. The underlying optical quantum technologies can only be realized through the integration of these components onto quan...

F. Setiawan, Peter Groszkowski, Hugo Ribeiro +1 more·Feb 4, 2021

Shortcuts to adiabaticity is a general method for speeding up adiabatic quantum protocols, and has many potential applications in quantum information processing. Unfortunately, analytically constructing shortcuts to adiabaticity for systems having co...

A. Jahn, J. Eisert·Feb 4, 2021

Recent progress in studies of holographic dualities, originally motivated by insights from string theory, has led to a confluence with concepts and techniques from quantum information theory. A particularly successful approach has involved capturing ...

A. Chatwin-Davies·Feb 3, 2021

These notes introduce a handful of core ideas from quantum information science that figure prominently in modern research on quantum gravity. The central concept that forms the base of these notes is that of a quantum channel; that is, the most gener...

A. Córcoles, M. Takita, K. Inoue +4 more·Feb 2, 2021

To date, quantum computation on real, physical devices has largely been limited to simple, time-ordered sequences of unitary operations followed by a final projective measurement. As hardware platforms for quantum computing continue to mature in size...

Hideyuki Miyahara, V. Roychowdhury·Feb 2, 2021

The paradigm of variational quantum classifiers (VQCs) encodes classical information as quantum states, followed by quantum processing and then measurements to generate classical predictions. VQCs are promising candidates for efficient utilizations o...

Xingrui Song, M. Naghiloo, K. Murch·Feb 1, 2021

While quantum measurement theories are built around density matrices and observables, the laws of thermodynamics are based on processes such as are used in heat engines and refrigerators. The study of quantum thermodynamics fuses these two distinct p...

I. Haygood, M. Pufall, E. Edwards +2 more·Feb 1, 2021

We report on the strong coupling between a metallic ferromagnetic Fe75Co25 thin film patterned element and a range of superconducting Nb half-wavelength co-planar waveguide (CPW) resonators. By varying the volume of the ferromagnet we demonstrate tha...

Elija Perrier·Feb 1, 2021

In this paper, we inaugurate the field of quantum fair machine learning. We undertake a comparative analysis of differences and similarities between classical and quantum fair machine learning algorithms, specifying how the unique features of quantum...

S. Blinov, Benwei Wu, C. Monroe·Jan 31, 2021

Quantum computing represents a radical departure from conventional approaches to information processing, offering the potential for solving problems that can never be approached classically. While large scale quantum computer hardware is still in dev...

Ivan Pogorelov, T. Feldker, Christian D. Marciniak +13 more·Jan 27, 2021

Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. Transitioning from lab-based, proof-of-concept experiments to robust, integrated realizations of quantum in...

M. B. Sambú, L. Sanz, F. M. Souza·Jan 26, 2021

We propose a theoretical protocol for reconstructing the density matrix of a single-electron spin qubit using spin-polarized transport. The system consists of a quantum dot coupled to ferromagnetic reservoirs and subject to a magnetic field lying in ...

M. Cerezo, A. Sone, J. Beckey +1 more·Jan 25, 2021

The quantum Fisher information (QFI) plays a crucial role in quantum information theory and in many practical applications such as quantum metrology. However, computing the QFI is generally a computationally demanding task. In this work we analyze a ...

Sara Bartolucci, P. Birchall, H. Bombin +10 more·Jan 22, 2021

Fusion gates are common operations in photonic quantum information platforms, where they are employed to create entanglement. Here, the authors propose a quantum computation scheme where the same measurements used to generate entanglement can also be...

Junxu Li, Zixuan Hu, S. Kais·Jan 22, 2021

Quantum communication is an important application that derives from the burgeoning field of quantum information and quantum computation. Focusing on secure communication, quantum cryptography has two major directions of development, namely quantum ke...

X. Mi, P. Roushan, C. Quintana +92 more·Jan 21, 2021

Description Quantum scrambling Information spreading in interacting quantum systems is of relevance to a wide range of settings, from black holes to strange metals. Mi et al. used the Sycamore quantum processor to study this process. Through judicial...

Lindsay Bassman Oftelie, M. Urbánek, Mekena Metcalf +3 more·Jan 21, 2021

Quantum materials exhibit a wide array of exotic phenomena and practically useful properties. A better understanding of these materials can provide deeper insights into fundamental physics in the quantum realm as well as advance information processin...

Julian Wechs, Hippolyte Dourdent, A. Abbott +1 more·Jan 21, 2021

Quantum supermaps are transformations that map quantum operations to quantum operations. It is known that quantum supermaps which respect a definite, predefined causal order between their input operations correspond to fixed-order quantum circuits. A...