Research

Packing information into light

How much information can we pack into a photon? In this we expolre how to increase the bandwidth of optical communication systems using patterns (spatial modes) of light. The optical links we study are in both free space and fibres. In particular we consider effects of noise in the form of turbulence and efficient creation and detection methods.

Secure quantum communication

Can we use high-dimensional entanglement as a resource for secure quantum communication? Entanglement holds such promise, yet is frustratingly fragile. In this project we study how to cover a large distance with photonic quantum states entangled in high-dimensions. Topics include Quantum Key Distribution (QKD), quantum teleportation and entanglement swapping.

Interaction free measurement

Is it possible to detect an object without any interaction with it? In this project we will implement the “bomb” thought experiment (following Elitzur-Vaidman) with light entangled in orbital angular momentum to detect objects by quantum interference, e.g., light sensitive biological matter.

Quantum imaging

Can we image a 2D object with a single pixel detector? Can we teleport images? In this project we will use our entanglement experiment to demonstrate ghost imaging, and use digital holograms to enable single pixel detection of the image.

Multi-dimensional quantum walks

Can we implement quantum walks with classical light? In this project we will use spin and orbital angular momentum light in the form of vector fields to realize multiple steps in a quantum walk with exotic geometries.

Building nano-structures with optical lattices

Can we use light as a glue to build 3D objects with nano-structured materials? In this project we will use holographic optical trapping and tweezing to manipulate nano materials into organized structures

Orbital angular momentum spectroscopy

Is it possible to slow the rotation of molecules with orbital angular momentum? Doppler-free spectroscopy slows molecules down in their linear momentum, enabling higher resolution. In this project we will consider the argument for using light’s angular momentum to achieve rotation-free spectroscopy.

Classical entanglement

Is it possible to build a quantum computer with classical light? Non-separability, the quintessential property of quantum entanglement, is not unique to quantum mechanics. In this project we will explore which quantum protocols can be implemented with non-separable classical light fields, which we refer to as classical entanglement.

Novel lasers

Can lasers be made to output any desired optical field? In this project we will explore intracavity control of both the dynamic and geometric phase of light to generate structured light directly from a laser.

Structured electron waves

Can we structure matter waves as we do with optical fields? Using tools traditionally associated with light, we wish to created structured electron wave packets that “break” the rules of physics.

In addition to the above we have active research in topics such as non-diffracting light, accelerating light, the Hall effect for light, self-healing light fields, digital holography, and creation and detection tools for laser light. We are also interested in creating educational portals for outreach.Download