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Articles by Martin Ringbauer
Versatile Fidelity Estimation with Confidence
As quantum devices become more complex and the requirements on these devices become more demanding, it is crucial to be able to verify the performance of such devices in a scalable and reliable fashion. A cornerstone task in this challenge is quantifying how close an experimentally prepared quantum state is to the desired one. Here we present a method to construct an estimator for the quantum state fidelity that is compatible with any measurement protocol.
A universal qudit quantum processor with trapped ions - Nature Physics
Abstract Most quantum computers use binary encoding to store information in qubits—the quantum analogue of classical bits. Yet, the underlying physical hardware consists of information carriers that are not necessarily binary, but typically exhibit a rich multilevel structure. Operating them as qubits artificially restricts their degrees of freedom to two energy levels1.
Experimental simulation of closed timelike curves
Abstract Closed timelike curves are among the most controversial features of modern physics. As legitimate solutions to Einstein’s field equations, they allow for time travel, which instinctively seems paradoxical. However, in the quantum regime these paradoxes can be resolved, leaving closed timelike curves consistent with relativity.
Game Over for “Spooky Action” Loophole
Over a 48-hour period, more than 100,000 citizen scientists generated random numbers while playing a video game. Credit: ICFO By Tara Roberson & Martin Ringbauer More than 100,000 citizen scientists have taken part in the world’s first global quantum physics experiment to test Einstein’s concept of “local realism”. To view this article subscribe or purchase a yearly pass here.
Multi-time quantum correlations with no spatial analog
Consider first the scenario introduced by John Bell,10 where two space-like separated observers, Alice and Bob, perform local measurements on the parts of a shared state of two entangled two-level systems (qubits) (Fig. 1a).
Crowdsourced gamers power quantum test with human randomness
More than half a million levels of a video game have provided random data for a global study testing the laws of quantum physics. University of Queensland’s ARC Centre of Excellence for Engineered Quantum Systems (EQUS) was one of 12 laboratories from five continents to participate in the Big Bell Test, coordinated by the Institute of Photonic Sciences (ICFO) in Barcelona.
Experimental simulation of closed timelike curves
While there has been some recent success on alternative models of CTCs based on post-selection23, 24, 25, we focus on the most prominent model for describing quantum mechanics in the presence of CTCs, introduced by Deutsch6. Here a quantum state |ψ〉 interacts unitarily with an older version of itself (Fig. 1). With the inclusion of an additional swap gate, this can equivalently be treated as a two-qubit system, where a chronology-respecting qubit interacts with a qubit ρ trapped in a CTC.
It’s 2015, so where’s my flying car?
Today, 21 October 2015, marks the day Marty McFly and Doc Brown arrive in the fictional future of the iconic film Back to the Future II. While we aren’t expecting the time-travelling duo, played by Michael J. Fox and Christopher Lloyd, to arrive from the past — what about the film’s other predictions of the year 2015? According to UQ researchers, it seems the filmmakers were both spot on and way off. Back to the future questions from The University of Queensland on Vimeo.
Physicists Prove Time Travel Possible by Sending Particles of Light into the Past
Scientists from the University of Queensland have used photons (single particles of light) to simulate quantum particles travelling through time. Their research, entitled "Experimental simulation of closed timelike curves", is published in the latest issue of Nature Communications. The grandfather paradox states that if a time traveller were to go back in time, he could accidentally prevent his grandparents from meeting, and thus prevent his own birth.
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