Table of contents

Atoms, molecules, and light have been at the forefront of understanding quantum mechanics, since its discovery over 100 years ago. Since then the field has progressed from understanding the most fundamental aspects of how particles behave under quantum mechanics to controlling individual atoms for creating new technologies. While matter and light are from ordinary experience rather different, with today's control of coherent quantum phenomena many of the ideas freely cross their respective boundaries. Some of the topics that will be covered at the conference include, but are not limited to, cold atoms & cold molecules, ultrafast & precision spectroscopy, quantum manipulation & precision measurement, quantum computing & quantum communication, and quantum metrology. In this conference we aim to bring together the leading experts working in the frontiers of atomic, molecular, and optical systems.

Scientific Committee:

Guoxiang Huang

Director,

NYU-ECNU Institute of Physics at NYU Shanghai;

Professor of Physics

Department of Physics and State Key Laboratory of Precision Spectroscopy East China Normal University

Daniel L. Stein

Director,

NYU-ECNU Institute of Physics at NYU Shanghai;

Professor of Physics and Mathematics Departments of Physics and Mathematics, NYU

Jian Wu

Director, Professor of Physics

State Key Laboratory of Precision Spectroscopy

East China Normal University

E Wu

Researcher

State Key Laboratory of Precision Spectroscopy East China Normal University

Haibin Wu

Professor of Physics

State Key Laboratory of Precision Spectroscopy East China Normal University

Tim Byrnes

Assistant Professor of Physics at NYU Shanghai

Invited Speakers:

Jurgen Appel (Copenhagen, Denmark)

Luiz Davidovich (Universidade Federal Do Rio De Janeiro, Brazil) Jonathan Dowling (LSU, USA)

Luming Duan (Michigan, USA)

Claude Fabre (Universite Pierre Et Marie Curie, France)

Elisabeth Giacobino (CNRS Laboratoire Kastler-Brossel, France)

Rudolf Grimm (Innsbruck, Austria)

Fedor Jelezko (Ulm, Germany)

Ruxin Li (SIOM, China)

Peter Van Loock (Mainz, Germany)

Longsheng Ma (ECNU, China)

Jian-Wei Pan (USTC, China)

Jean-Francois Roch (ENS Cachan, France)

Bao-Sen Shi (USTC, China)

Masahito Ueda (Tokyo, Japan)

Pengjun Wang (Shanxi, China)

Jorg Wrachtrup (Stuttgart, Germany)

Min Xiao (Arkansas, USA)

Lei Xu (Fudan, China)

Li You (Tsinghua, China)

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

Coherently coupled pairs or multimers of nitrogen-vacancy defect electron spins in diamond have many promising applications especially in quantum information processing (QIP) but also in nanoscale sensing applications. Scalable registers of spin qubits are essential to the progress of QIP. Ion implantation is the only known technique able to produce defect pairs close enough to allow spin coupling via dipolar interaction. Although several competing methods have been proposed to increase the resulting resolution of ion implantation, the reliable creation of working registers is still to be demonstrated. The current limitation are residual radiation-induced defects, resulting in degraded qubit performance as trade-off for positioning accuracy. Here we present an optimized estimation of nanomask implantation parameters that are most likely to produce interacting qubits under standard conditions. We apply our findings to a well-established technique, namely masks written in electron-beam lithography, to create coupled defect pairs with a reasonable probability. Furthermore, we investigate the scaling behavior and necessary improvements to efficiently engineer interacting spin architectures.

We study multiple period states (i.e., states whose period is a multiple of the lattice constant) of a two-component unpolarized superfluid Fermi gas in an optical lattice along the crossover between the Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensate (BEC) states. By solving Bogoliubov-de Gennes equations for a superfluid flow with finite quasimomentum, we find that, in the BCS side of the crossover, the multiple period states can be energetically favorable compared to the normal Bloch states and their survival time against dynamical instability drastically increases, suggesting that these states can be accessible in current experiments. This is in sharp contrast to the situation in BECs.

Quantum coherence is investigated using a new measure with metric properties and entropic nature and decomposed into local and intrinsic contributions. The trade-off relation between these contributions as well as their distribution properties are studied for simple tripartite systems and the more complex spin chain model. We find that the coherence changes its nature with respect to the parameters of the quantum state under investigation.

In coherent control of Bose-Einstein condensates (BEC) the major limitation to successful high fidelity transfer using optical Raman transitions is spontaneous emission of radiation and the decoherence that this causes. We present a scheme based on stimulated Raman adiabatic passage (STIRAP) designed specifically for Rubidium 87. STIRAP is a method of population transfer that relies on the adiabatic theorem of quantum mechanics. Instead of transferring population between Hamiltonian ground states, one adiabatically evolves the ground states into some desired superposition. We show that one may thereby implement arbitrary rotations of spinor BECs with extremely high fidelities. Our simulations show that given a BEC with N = 10⁴ atoms, we may do an arbitrary unitary rotation with an infidelity of about 10^-7 that takes approximately 100 ns.

We propose a method to enhance Kerr nonlinearities and realize low-power gigahertz solitons via plasmon induced transparency (PIT) in a new type of metamaterial, which is constructed by an array of unit cell consisting of a cut-wire and a pair of varactor- loaded split-ring resonators. We show that the PIT in such metamaterial can not only mimic the electromagnetically induced transparency in coherent three-level atomic systems, but also exhibit a crossover from PIT to Autler-Townes splitting. We further show that the system suggested here also possess giant second- and third-order nonlinear optical susceptibilities, which may be used to create plasmon solitons and dromions with extremely low power. Our studies raise the possibility for obtaining strong nonlinear effects of gigahertz radiation at very low intensity based on room temperature metamaterials.

Broadband and ultra-broadband half-wave plates with composite design were previously experimentally demonstrated by E. Dimova et. al., in Opt. Commun. 366, 382 (2016). To achieve broadband and ultra-broadband performance, the authors utilized the relative rotation between the individual identical half-wave plates as control parameters, thus simulating the well-known control technique of composite pulses from quantum optics. In this paper, we extend the broadband and ultra-broadband designs by relaxing the condition of having identical constituent half-wave plates and allow for their thicknesses to also be variable control parameters. We further relax the condition of having symmetric rotation angles and solve numerically for both control parameters - rotation angles and thicknesses of the birefringent plates. We show that the presented design is broadband over a much wider range of the wavelengths, compared to the original design, when using the same number of constituent half-wave plates.

Projective measurement can increase the entropy of a state ρ, the increased entropy is not only up to the basis of projective measurement, but also has something to do with the properties of the state itself. In this paper we define this increased entropy as basis entropy. And then we discuss the usefulness of this new concept by showing its application in deciding whether a state is pure or not and detecting the existence of quantum discord. And as shown in the paper, this new concept can also be used to describe decoherence.