Showing 2019 · quant-phShow all

22 papers · 2 filters

quant-ph2019★ 29 cited

Quantum processing with ensembles of rare earth ions in a stoichiometric crystal

R. L. Ahlefeldt, M. J. Pearce, M. R. Hush +1

We describe a method for creating small quantum processors in a crystal stoichiometric in an optically active rare earth ion. The crystal is doped with another rare earth, creating…

quant-ph2019★ 3 cited

Feasibility study of a coherent feedback squeezer

Shota Yokoyama, Daniel Peace, Warit Asavanant +6

We investigate a coherent feedback squeezer that uses quantum coherent feedback (measurement-free) control. Our squeezer is simple, easy to implement, robust to the gain fluctuatio…

quant-ph2019★ 37 cited

Ultrastrong coupling between a microwave resonator and antiferromagnetic resonances of rare earth ion spins

Jonathan Everts, Gavin G. G. King, Nicholas Lambert +3

Quantum magnonics is a new and active research field, leveraging the strong collective coupling between microwaves and magnetically ordered spin systems. To date work in quantum ma…

quant-ph2019★ 15 cited

Multi-mode CV-QKD with Non-Gaussian Operations

Mingjian He, Robert Malaney, Jonathan Green

Non-Gaussian operations have been studied intensively in recent years due to their ability to increase the secret key rate for certain CV-QKD protocols. However, most previous stud…

quant-ph2019★ 3 cited

Teleportation of a Schrödinger's-Cat State via Satellite-based Quantum Communications

Hung Do, Robert Malaney, Jonathan Green

The Schrödinger's-cat state is created from the macroscopic superposition of coherent states and is well-known to be a useful resource for quantum information processing protocols.…

quant-ph2019★ 3 cited

Hybrid Entanglement Swapping for Satellite-based Quantum Communications

Hung Do, Robert Malaney, Jonathan Green

Hybrid entanglement swapping supports the teleportation of any arbitrary states, regardless of whether the quantum information in the state is encoded in Discrete Variables (DV) or…

quant-ph2019★ 12 cited

Global Entanglement Distribution with Multi-mode Non-Gaussian Operations

Mingjian He, Robert Malaney, Jonathan Green

Non-Gaussian operations have been studied intensively in recent years due to their ability to enhance the entanglement of quantum states. However, most previous studies on such ope…

quant-ph2019★ 9 cited

Improving QKD for Entangled States with Low Squeezing via Non-Gaussian Operations

Eduardo Villaseñor, Robert Malaney

In this work we focus on evaluating the effectiveness of two non-Gaussian operations, photon subtraction (PS) and quantum scissors (QS) in terms of Continuous Variable (CV)-Quantum…

quant-ph2019★ 19 cited

High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions

Yuan-Chi Yang, S. N. Coppersmith, Mark Friesen

Quantum dot hybrid qubits exploit an extended charge-noise sweet spot that suppresses dephasing and has enabled the experimental achievement of high-fidelity single-qubit gates. Ho…

quant-ph2019★ 75 cited

Auto-tuning of double dot devices in situ with machine learning

Justyna P. Zwolak, Thomas McJunkin, Sandesh S. Kalantre +7

The current practice of manually tuning quantum dots (QDs) for qubit operation is a relatively time-consuming procedure that is inherently impractical for scaling up and applicatio…

quant-ph2019★ 5 cited

Quantum Stochastic Processes and the Modelling of Quantum Noise

Hendra I. Nurdin

This brief article gives an overview of quantum mechanics as a {\em quantum probability theory}. It begins with a review of the basic operator-algebraic elements that connect proba…

quant-ph2019★ 26 cited

Measurements of capacitive coupling within a quadruple quantum dot array

Samuel F. Neyens, E. R. MacQuarrie, J. P. Dodson +9

We present measurements of the capacitive coupling energy and the inter-dot capacitances in a linear quadruple quantum dot array in undoped Si/SiGe. With the device tuned to a regi…

quant-ph2019★ 7 cited

Detecting Orbital Angular Momentum of Light in Satellite-to-Ground Quantum Communications

Ziqing Wang, Robert Malaney, Jonathan Green

Satellite-based quantum communications enable a bright future for global-scale information security. However, the spin orbital momentum of light, currently used in many mainstream…

quant-ph2019

Certification of spin-based quantum simulators

Abolfazl Bayat, Benoit Voisin, Gilles Buchs +3

Quantum simulators are engineered devices controllably designed to emulate complex and classically intractable quantum systems. A key challenge is to certify whether the simulator…

quant-ph2019★ 9 cited

Preparation of bipartite bound entangled Gaussian states in quantum optics

Shan Ma, Matthew J. Woolley, Xiaojun Jia +1

The positivity of the partial transpose is in general only a necessary condition for separability. There exist quantum states that are not separable, but nevertheless are positive…

quant-ph2019★ 85 cited

A silicon quantum-dot-coupled nuclear spin qubit

Bas Hensen, Wister Wei Huang, Chih-Hwan Yang +9

Single nuclear spins in the solid state have long been envisaged as a platform for quantum computing, due to their long coherence times and excellent controllability. Measurements…

quant-ph2019★ 13 cited

Calibration of cryogenic amplification chains using normal-metal--insulator--superconductor junctions

Eric Hyyppä, Máté Jenei, Shumpei Masuda +7

Various applications of quantum devices call for an accurate calibration of cryogenic amplification chains. To this end, we present a convenient calibration scheme and use it to ac…

quant-ph2019★ 24 cited

Inter-satellite Quantum Key Distribution at Terahertz Frequencies

Ziqing Wang, Robert Malaney, Jonathan Green

Terahertz (THz) communication is a topic of much research in the context of high-capacity next-generation wireless networks. Quantum communication is also a topic of intensive rese…

quant-ph2019★ 32 cited

Revealing quantum chaos with machine learning

Y. A. Kharkov, V. E. Sotskov, A. A. Karazeev +2

Understanding properties of quantum matter is an outstanding challenge in science. In this paper, we demonstrate how machine-learning methods can be successfully applied for the cl…

quant-ph2019★ 8 cited

Photonic Engineering for CV-QKD over Earth-Satellite Channels

Mingjian He, Robert Malaney, Jonathan Green

Quantum Key Distribution (QKD) via satellite offers up the possibility of unconditionally secure communications on a global scale. Increasing the secret key rate in such systems, v…

quant-ph2019★ 2 cited

Subspace Stabilization Analysis for Non-Markovian Open Quantum Systems

Shikun Zhang, Kun Liu, Daoyi Dong +2

Studied in this article is non-Markovian open quantum systems parametrized by Hamiltonian H, coupling operator L, and memory kernel function γ, which is a proper candidate for desc…

quant-ph2019★ 40 cited

Learning Nonlinear Input-Output Maps with Dissipative Quantum Systems

Jiayin Chen, Hendra I. Nurdin

In this paper, we develop a theory of learning nonlinear input-output maps with fading memory by dissipative quantum systems, as a quantum counterpart of the theory of approximatin…