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Extending on our previous work on Leggett-Garg inequalities, we recently demonstrated the venerable Hardy paradox and the violation of a state-independent Bell inequality in a temporal scenario. Our work has now appeared in PRL. Tests of quantum mechanics, such as the Bell inequality, are usually carried out in a spatial scenario, where measurements performed on […]

We have a new paper, titled “Efficient measurement of quantum dynamics via compressive sensing” in PRL. I already spent a significant amount of time with my co-authors on writing the paper and the press release so I’m not gonna invent the wheel a third time and just post some excerpts from the UQ press release […]

The referee reports are in and you’re faced with a familiar situation: they are positive, hooray, but there is an ambiguous suggestion which you don’t quite understand. What follows is a lot of second-guessing, a number of meetings with your co-authors, lengthy editing of the paper to implement whatever you think the referees wanted you […]

For those who haven’t seen it yet, there are two new journals, the American Institue of Physics’ (AIP) AIP Advances and American Physical Society’s (APS) Physical Review X (PRX). Both are representative of a recent trend for traditional publishers to move to open access, online-only publishing models. Another example would be Nature Communications, a journal […]

We have a new paper in Optics Express, “Engineered optical nonlinearity for quantum light sources“. We demonstrate a simple technique of longitudinal shaping of bi-photon wavepackets created via spontaneous parametric downconversion (SPDC). In a standard SPDC experiment, wavepackets have a sinc frequency spectrum. This is due to the fact that a crystal has finite length […]

After one week of closure due to floodings, UQ is now almost back to full speed. The lower lying areas were pretty hard hit but the essential buildings and services survived unscathed. Here’s a Courier Mail video from UQ and surrounding suburbs. UQ footage starts at 3:31 but the whole video is interesting, really.

Our paper “Violation of local realism with freedom of choice” has just been published in the Proceedings of the National Academy of Sciences (PNAS). An explanatory post on a paper about Bell inequalities usually starts with recounting the history and controversy of entanglement starting in 1935. I’ll spare you this part, you’ve probably read it […]

Today, New Journal of Physics has published our paper “Matchgate quantum computing and non-local process analysis“. Matchgates are an intriguing class of two-qubit quantum logic gates. Circuits built up solely by matchgates, acting on neighbouring qubits, are efficiently simulatable classically. If the gates are however, allowed to act on any two qubits, which can be […]

Single-photon pair sources based on the nonlinear process of spontaneous parametric downconversion are still a relatively young development. They are however probably one of the most successful tools of modern experimental science in terms of the massive impact they had on the field of quantum information processing. They provided the first bright source of  entangled […]

We have a new paper, ‘Quantum entanglement distribution with 810 nm photons through telecom fibers‘, in Applied Physics Letters as of today (also available on the arXiv here). The experiment has been done in Thomas Jennwein’s group at IQC in Canada and demonstrates that entangled photons at 810 nm can be transmitted through 1550 nm, […]