Quantum information using Bose-Einstein condensates

Today groups across the world are experimenting with various technologies in the pursuit of novel quantum information processing devices.  Some of the more famous examples are ion traps, quantum dots, superconducting qubits, cold atoms in optical lattices, N-V centres in diamond, and photons.  Here we are interested in using Bose-Einstein condensates for quantum information, which are interesting because they exhibit quantum phenomena on a macroscopic scale! Find out more

Quantum information theory: entanglement and coherence

coherence Coherence has long been one of central concepts of quantum physics and hence its detection and quantification is a fundamental task.  The distinction between classical (coherence in the absence of quantum fluctuations e.g. bright coherent light) and quantum coherence is has been made traditionally using phase space distributions and higher order correlation functions.  Though these methods give a distinction between the classical and quantum forms of coherence they do not give us any procedure to measure the amount of coherence in the system. One of the new entrants in the field of quantum correlations is quantum coherence. Find out more.

Atom chips for quantum information

atomchips   Neutral atom systems are a powerful platform to perform experiments at the quantum limit.  Perhaps the most practically used demonstration are atomic clocks, which determine the standard of the second, determined as a fixed number of Rabi oscillations between hyperfine states of atoms such as Cesium or Rubidium, in the microwave range. Atom chips have been developed  to realize cold atom experiments in a compact configuration.  Find out more

Exciton-polariton condensates and new quantum technologies

Exciton-polaritons are particles that live inside semiconductor microcavity structures, when they are illuminated by laser light.  Recently these particles have been observed to undergo Bose-Einstein condensation (BEC).  Unlike atomic systems that require nanokelvin temperatures in order to under BEC, exciton-polaritons typically only require about 10K, or even higher depending on the materials chosen.  This opens the question: what kind of new technologies will these discoveries bring? We investigate this along several lines of thought, from quantum simulation to light emitting devices. Find out more

Relativistic quantum information

satellites One of the key quantum technologies that is in current development worldwide is the quantum communications network. In a quantum network, individual quantum nodes have capabilities of storing and/or manipulating quantum information. These are then interconnected using quantum channels, such than quantum information can be exchanged between the nodes. Such a quantum network can be viewed as a natural extension of quantum key distribution (QKD) networks which exist today, which predominantly consist of the quantum channels without quantum memories at the nodes. Find out more. 

BEC-BCS crossover of exciton-polaritons

An exciton is an composite particle made of an electron and a hole, which are both fermions.  Since two fermions make a boson, an exciton is a bosonic particle which can potentially undergo Bose-Einstein condensation.  At high density the underlying fermionic components of the excitons start to play a role, and it is known that the state is more like a BCS-state, familiar from superconductivity.  But what happens for exciton-polaritons? Find out more

Quantitative biology

recombination Quantitative approaches to biology are taking an increasingly important role in understanding biological phenomena.  The great advances in systems biology have shown that computational and mathematical approaches can lead to insights that are complementary to the more traditional approach.  Bioinformatics tools are now commonplace in the context of genomics, molecular biology, and structural biology to better analyze biological data. Find out more

Novel light sources using exciton-polaritons

  Lasers have found many uses in society, taking advantage of the useful properties of coherent light.  In a normal laser the photons do not interact, which leads to a Wigner function that is positive everywhere.  Here we develop a new type of laser based on exciton-polariton condensates that produce light with a negative Wigner function completely deterministically and continuously.  Find out more

Accelerated optimization using Bose-Einstein condensates

When a Bose-Einstein condensates (BECs) forms, all the bosons undergo a phase transition such that they enter the lowest energy state of the system.  Meanwhile, many computationally difficult problems can be reformulated into an optimization problem.  The idea here is that we use the power of BECs to solve a given optimization problem. Unlike standard quantum computing where superposition is the resource, here we are using indistinguishability to solve the problem. Find out more

What we do

Welcome to the page of Tim Byrnes at NYU Shanghai -- New York University's campus in Shanghai.  We do a wide variety of research topics, ranging from quantum information technologies, experimental atom chip BECs, exciton-polariton BECs, quantitative biology, relativistic quantum information, quantum information theory, and fundamental cold atom physics. Find out more about what we do in our research page.

About us


nyucollage3

Find out more about who is involved in this research, and opportunities to work with us through internship programs, visiting programs, and open positions.  Information on getting to NYU can be found on the contacts page.

CIMG4083

 

Full name: Jiaqi Xi

Position: Undergraduate Research Assistant

Nationality: Chinese

Career: 2015-2019 B.Sc in Honors Mathematics at NYU Shanghai

 

 

Comments are closed.