Papers

Ben Bartlett, A. Dutt, S. Fan·Jan 19, 2021

Photonics offers unique advantages as a substrate for quantum information processing, but im-poses fundamental scalability challenges. Nondeterministic schemes impose massive resource overheads, while deterministic schemes require prohibitively many i...

M. Hays, V. Fatemi, D. Bouman +9 more·Jan 17, 2021

Superconducting spin qubit To date, the most promising solid-state approaches for developing quantum information-processing systems have been based on the circulating supercurrents of superconducting circuits and manipulating the spin properties of e...

Dileep Singh, Arvind, K. Dorai·Jan 6, 2021

We present a generalized quantum scattering circuit which can be used to perform non-invasive quantum measurements, and implement it on NMR qubits. Such a measurement is a key requirement for testing temporal non-contextual inequalities. We use this ...

Y. Deville, A. Deville·Jan 5, 2021

The term"machine learning"especially refers to algorithms that derive mappings, i.e. intput/output transforms, by using numerical data that provide information about considered transforms. These transforms appear in many problems, related to classifi...

Phattharaporn Singkanipa, P. Kok·Jan 5, 2021

Conference key agreement (CKA) is an information processing task where more than two parties want to share a common secret key. Here, we present a loss-resilient protocol for CKA, based on redundant encoding and error correction. Our protocol provide...

N. K. Raut, Jeffery Miller, R. Chiao +1 more·Jan 5, 2021

We report the first experimental demonstration of Meissner-effect levitation of a millimeter-scale neodymium magnet within a cm-scale superconducting aluminum coaxial quarter-wave stub cavity. The coaxial mode's resonance frequency shifts as a functi...

Jesús Lacalle, L. M. P. Coronado, A. Oliveira·Jan 1, 2021

In this work, we prove that quantum error correcting codes do not fix isotropic errors (Theorem 5), even assuming that their correction circuits do not introduce new errors. We say that a quantum code does not fix a quantum computing error if its app...

Yilun Xu, Gang-Ming Huang, J. Balewski +6 more·Dec 31, 2020

As quantum information processors grow in quantum bit (qubit) count and functionality, the control and measurement system becomes a limiting factor to large-scale extensibility. To tackle this challenge and keep pace with rapidly evolving classical c...

E. Mascot, M. Nozaki, Masaki Tezuka·Dec 29, 2020

Understanding how and whether local perturbations can affect the entire quantum system is a fundamental step in understanding non-equilibrium phenomena such as thermalization. This knowledge of non-equilibrium phenomena is applicable for quantum comp...

Anandu Kalleri Madhu, A. Melnikov, Leonid Fedichkin +2 more·Dec 28, 2020

Simulation and programming of current quantum computers as Noisy Intermediate-Scale Quantum (NISQ) devices represent a hot topic at the border of current physical and information sciences. The quantum walk process represents a basic subroutine in man...

Zheng Tan, Patrice A. Camati, Guillaume Coeuret Cauquil +2 more·Dec 25, 2020

We theoretically derive and experimentally compare several different ways to access entropy production in a quantum process under feedback control. We focus on a bipartite quantum system realizing an autonomous Maxwell’s demon scheme reported by Naje...

Xijia Miao·Dec 24, 2020

The HSSS quantum search process owns the dual character that it obeys both the unitary quantum dynamics and the mathematical-logical principle of the unstructured search problem. It is essentially different from a conventional quantum search algorith...

Anthony Bordg, Hanna Lachnitt, Yijun He·Dec 24, 2020

In this article we present an ongoing effort to formalise quantum algorithms and results in quantum information theory using the proof assistant Isabelle/HOL. Formal methods being critical for the safety and security of algorithms and protocols, we f...

S. Ebadi, Tout T. Wang, H. Levine +12 more·Dec 22, 2020

Motivated by far-reaching applications ranging from quantum simulations of complex processes in physics and chemistry to quantum information processing1, a broad effort is currently underway to build large-scale programmable quantum systems. Such sys...

Conor Mc Keever, Marzena H. Szyma'nska·Dec 22, 2020

Being able to describe accurately the dynamics and steady-states of driven and/or dissipative but quantum correlated lattice models is of fundamental importance in many areas of science: from quantum information to biology. An efficient numerical sim...

Pedro Parrado-Rodríguez, C. Ryan-Anderson, A. Bermudez +1 more·Dec 21, 2020

Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long computations reliably. Progres...

Veit Langrock, D. DiVincenzo·Dec 17, 2020

We report a substantially simplified procedure, based on group-theoretic reasoning, for the reduction of qubit leakage in exchange-only spin qubits. We to find exchange sequences which accomplish leakage reduction with only two additional spins and w...

Chenfeng Cao, Xin Wang·Dec 15, 2020

Quantum autoencoder is an efficient variational quantum algorithm for quantum data compression. However, previous quantum autoencoders fail to compress and recover high-rank mixed states. In this work, we discuss the fundamental properties and limita...

A. Pal, P. Schindler, A. Erhard +5 more·Dec 14, 2020

Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by storing it in logical qubits, built from ensembles of entangled physical ...

Pragati Gupta, C. M. Chandrashekar·Dec 14, 2020

Digital quantum simulation on quantum systems require algorithms that can be implemented using finite quantum resources. Recent studies have demonstrated digital quantum simulation of open quantum systems on Noisy Intermediate-Scale Quantum (NISQ) de...