General relativity predicts the possibility of space-time geometries that contain closed time-like curves (CTCs), along which a particle could travel back in time and interact with its past self. Studies of simple bouncing billiard balls along CTCs have revealed a surprising feature: Given the...

# Quantum Science

The first quantum revolution of the 1950's led to many technologies that have become ubiquitous in society in the 21st century, including consumer electronics, computing, sensing, medical imaging, and the Global Positioning System. Physics at The University of Queensland is an international leader of the second quantum revolution, based on the understanding, control, and engineering of quantum many-body systems. The recent Excellence in Research Australia assessment gave quantum physics at UQ the maximum rating of "well above world standard." UQ has a number of ARC research fellows, and many well-funded research groups in theoretical and experimental quantum science. We are the lead institution for the ARC Centre of Excellence for Engineered Quantum Systems, and host a node of the ARC Centre of Excellence for Quantum Computation and Communication Technology.

## Quantum Science

## Staff

## Research Groups

## Available Projects

All fundamental interactions known in nature are *local*: only close-by systems can interact. But where does the very notion of *closeness* come from? Ultimately, we only learn about spatial relations through physical systems, it should thus be possible to understand the locality...

Quantum information has developed in the last decades into a broad field, offering several promising applications for future technology and deep insights into the foundations of physics. Very recently, first steps have been made in the direction of theoretically characterising and experimentally...

**Duration: **6-8 weeks

**Contact for further information: **Email andrew.white@uq.edu.au; phone +61 7 336 57902 or +61 7 336 53415.

**Duration: **6-8 weeks

**Contact for further information: **Email andrew.white@uq.edu.au or phone +61 7 336 57902 or +61 7 336 53415.

**Suitable for: **Students with an interest in quantum physics.

**Project: **Classical information is represented as bits in a string of 0s and 1s. In quantum mechanics, anything in between is possible - you can have superpositions of 0s and 1s...

**Suitable for: **Advanced undergraduates, with strong physics or chemistry background.

**Project: **To head off the threat to the planet posed by climate change we need to develop radical new technologies that change the way we generate and use...

**Suitable for: **Advanced undergraduates, with strong physics background.

**Project: **High temperature superconductivity is one of the great unsolved problems in physics. In order to understand it we must solve the Schrodinger equation for ~...

**Suitable for: **Advanced undegraduates, with strong physics background.

**Project: **Spin liquids are exotic phases of matter where quantum fluctuations suppress classical long-range order. They are of particular interest because they may...

**Suitable for: **Students with an interest in computational science and theoretical quantum physics. Students should have completed at least two years of physics study, and be familiar with quantum mechanics, thermodynamics, and preferably statistical mechanics.

**Suitable for: **Second or third year students interested in theoretical and computational quantum physics; some experience with Linux helpful but not essential.

**Project: **Molecular crystals often have strange electronic and magnetic properties;...

**Suitable for: **Students interested in theoretical and computational quantum physics.

**Project: **This project aims to use the methods of statistical physics to help understand the equilibrium and dynamics and of interacting plant communities (with...

**Suitable for: **Students interested in theoretical and computational quantum physics.

**Project: **In the 1970s there was speculation that the cause of superfluidity in helium-4 was not due to Bose-Einstein condensation, but a form of Cooper pairing...

**Suitable for: **Students interested in theoretical and computational quantum physics.

**Project: **One of the key insights of Landau was to derive a phenomenological formula for the critical velocity in a superfluid. In a Bose gas this is...

**Suitable for: **Students interested in theoretical and computational quantum physics.

**Project: **The aim of this project is to make a connection between classical mechanics and quantum mechanics - looking for the signatures of classical...

Floquet theory finds solutions to Hamiltonian systems that are periodic in time. They are easy to find via ...

When two superfluids are connected by a weak link, they exhibit the Josephson effect – oscillations in the current between the two fluids. This project would...

See Mason, D. J., Borunda, M. F., & Heller, E. J. (2015). Revealing the flux: Using processed Husimi maps to visualize dynamics of bound systems and...

Tensor Networks provide a representation of a quantum many-body wave-function (or a classical partition function) that is suitable for computational methods, mainly for low-dimensional problems (1D and 2D). The most mature branch of tensor networks is known as Matrix Product States (MPS), also...

Exisiting at temperatures near absolute zero,...

Our planned production of spinor condensates will require careful control of external magnetic fields. In an effort to do this, we will be...

This project will centre on implementing and characterising the darkground imaging...

Our lab has recently demonstrated the ability to control the density of an 87Rb BEC on a...

PhD, Masters, Honours, and Summer projects are available in the area of fundamental tests of quantum mechanics in macroscopic regimes. The project addresses an open fundamental question in physics of how quantum mechanics applies to systems...

The project aims to develop a new theoretical approach - stochastic quantum hydrodynamics - to understand one of the grand challenges of physics: how do complex, many-particle systems evolve in the quantum realm when driven far from equilibrium? Understanding the out-of-equilibrium of such...

Superradiance occurs when several emitters emit radiation in phase, causing the emission to occur much faster than it would if each emitter was independent. This project is about simulating...

High temperature superconductivity is one of the great unsolved problems in physics. In order to understand it we must solve the Schrodinger equation for ~1023 electrons that are interacting strongly with one...

Spin liquids are exotic phases of mater where quantum fluctuations suppress classical long-range order. They are of particular interest because they may support deconfined ...

Unlike electronics, devices based around ultra-cold atoms aren’t strongly coupled to the environment through the electromagnetic interaction, so make an ideal test-bed for tests of coherent...

Photosynthetic organisms harvest light through large antenna complexes containing many chlorophyll molecules. Recent experiments have found that energy may be transported through antenna...

The major roadblock for optical quantum information technologies is the absence of reliable single- and entangled- photons sources. The standard technique to generate such states employ the photons...

Hybrid quantum technologies seek to alleviate the short commings of two individual quantum architectures by moving the information between the two systems. Commonly one seeks to exploit the excellent readout and storage capabilities of...

Quantum communication is already the first commercial application of quantum technology allowing the secure sharing of secrets over a dedicated channel. However the achievable distances are limited due to the inability to build efficient quantum repeaters —systems that teleport the quantum...

Photons are one of the strongest candidates to implement scalable quantum computing and simulation architectures [1]. They are ideal for the distribution of quantum information and can be readily manipulated using a wealth of existing telecommunications technologies. However, the primary...

A number of Honors and Summer projects are available in the Quantum Device Laboratory, The University of Queensland. The student will have unique...

A number of Master and PhD studentships are available in the Quantum Device Laboratory, The University of Queensland in the area of superconducting quantum circuits. The laboratory aims at developing the next generation of superconducting nanodevices consisting of superconducting qubits or...

Over the last 3 years we have been developing a theory to understand the ...

When building a quantum computer, or other quantum processing device, it is important to be able recover from errors that may arise. This is accomplished using error correcting codes, which redundantly encode quantum information in...

Our two most fundamental theories of the universe are general relativity and quantum mechanics. Both work extremely well in predicting and quantifying phenomena in their respective regimes of application, but at a deep level the two theories are incompatible. Relativistic Quantum Information...

Communications based on exchanging quantum particles such as photons can achieve outcomes that are impossible with classical communication systems. For example quantum key distribution (QKD) can achieve unconditionally secure communication. Because of the fragility of quantum particles, special...

Quantum Computers promise major speed-ups in computation times for certain problems. Building a large-scale, universal quantum computer is a major practical challenge and still seems a long way off. However, recent results suggest that single-purpose quantum computers are far more practical in...

Some recent developments in statistical mechanics have come up with new geometric interpretations of thermodynamic quantities. This project would look at applying these ideas to the Bose gas. In particular, it would be to analytically incorporate additional conserved quantities into...

Polariton condensates occur in two-dimensional semiconductor microcavities pumped by a laser. The light excites electrons from the valence band to the conduction band,...

In the 1970s there was speculation that the cause of superfluidity in helium-4 was not due to Bose-Einstein condensation, but a form of Cooper pairing between attractive bosons,...

This project simulates the quantum dynamics of a “spin-1” Bose gas in a double well potential. A spin-1 gas has three spin components, which can interconvert due to spin-collisions (...

"And therefore, the problem is, how can we simulate the quantum mechanics?...We can give up on our rule about what the computer was, we can say: Let the computer itself be built of quantum mechanical elements which obey quantum mechanical laws. ...

This theoretical project uses fermionic matterwaves to increase the sensitivity of atom interferometers for precision measurement. The focus on...

This project is aimed at a theoretical and computational exploration of atoms and how they tick. With recent atomic physics experiments being able to measure towards accuracies of 1 part in 10^{18}, they require high-...

This project is aimed at a theoretical and computational exploration of the quantum-atom optics of ultracold matter. The goal is to design and characterise novel high-...

Modelling the behavior of correlated electrons in finite systems is at the heart of theoretical chemistry. Many sophisticated techniques have been...

This project involves using minimal physical Hamiltonian models to study the flow of energy and information associated with the dynamical breakdown of the Born...

Dilute gas Bose-Einstein condensates (BECs) were experimentally observed for the first time in 1995, more than seventy years after their initial proposal by Einstein. Like helium-4 below the lambda point, they exhibit the defining...

The project seeks to understand an open fundamental problem in physics: How do complex microscopic interactions in many-particle systems lead to the emergence of a qualitatively new behavior and to the formation of new states of quantum matter. We will investigate this problem in the context of...

A non-Gaussian system is one for which the outputs do not obey Gaussian statistics. In the continuous-variable regime, this normally means a nonlinearity of higher than second order in the interaction Hamiltonian. Well known systems meeting this criterion are trapped Bose-Einstein condensates...

For quantum computing and simulation using neutral atoms trapped in a lattice one needs a physically scalable system that can facilitate single qubit initialization, gate and entanglement operations and state selective read-out. The...

Since the first experimental realization of a Bose-Einstein condensate (BEC), many of its properties have been thoroughly investigated. Superfluidity is one of the properties of a...

The stochastic Gross-Pitaevskii formalism can sample the grand-canonical ensemble for the interacting Bose gas by assuming the ergodic hypothesis that time evolution fairly...

Taking advantage of the subtleties of quantum mechanics to do useful tasks is one of the keys to future technological advances. In the Centre for Engineered Quantum systems, we are developing theory and experiment to identify promising systems to that end. For instance, recent...

An atom laser is a device that spits out atoms in the same way that an optical laser spits out light: That is, it creates an atomic matterwave with a well defined wavelength, amplitude and phase. Such a system is interesting for...

An atom interferometer is a device that utilizes the quantum wave-like nature of atoms to make extremely sensitive measurements of quantities such as rotations and accelerations. This...

How do isolated quantum systems thermalise? Isolated quantum systems undergo unitary evolution which preserves the entropy. However, at the level of statistical mechanics, any disturbance will lead to an increase in entropy...

Bose-Einstein condensates in a double-well potentials have been used as a relatively simple system in which to study the quantum many-body physics of ultracold atoms, in particular the interplay of quantum...

The propagation of ultrashort pulses of light in optical fibre has proved to be a very efficient method of 'squeezing' the quantum properties of light. Squeezing means the...

A PhD projects are available within the Queensland Quantum Optics Laboratory in the areas of photonics, quantum optics, and quantum opto-mechanics. The lab aims to answer fundamental questions in quantum physics, and develop proof-of-principle applications in sensing and metrology. The key...

## Associated Research Centres

- ARC Centre of Excellence for Quantum Computation and Communication Technology
- ARC Centre of Excellence for Engineered Quantum Systems
- ARC Centre of Excellence for Quantum-Atom Optics
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies
- Precision Sensing Initiative
- Quantum Sciences Laboratory

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