January 13, 2017:
Demon Dynamics: Deterministic Chaos, the Szilard Map, and the Intelligence of Thermodynamic Systems by James P. Crutchfield, University of California at Davis 

February 2, 2017:
Holographic quantum errorcorrecting codes by Fernando Pastawski, Institute for Quantum Information and Matter (IQIM) 

March 23, 2017:
Quantum Physics: A Possible Theory of the World as a Whole by Vlatko Vedral, CQT, NUS 

April 27, 2017:
The applied side of Bell nonlocality by Valerio Scarani, CQT, NUS 
Date: 13 January 2017, 4pm
Venue: CQT Seminar Room, S150315
Speaker: James P. Crutchfield, University of California at Davis
We introduce a deterministic chaotic system—the Szilard Map—that encapsulates the measurement, control, and erasure protocol by which Maxwellian Demons extract work from a heat reservoir. Implementing the Demon's control function in a dynamical embodiment, our construction symmetrizes Demon and thermodynamic system, allowing one to explore their functionality and recover the fundamental tradeoff between the thermodynamic costs of dissipation due to measurement and due to erasure. The map's degree of chaos—captured by the KolmogorovSinai entropy—is the rate of energy extraction from the heat bath. Moreover, an engine's statistical complexity quantifies the minimum necessary system memory for it to function. In this way, dynamical instability in the control protocol plays an essential and constructive role in intelligent thermodynamic systems.
Date: 2 February 2017, 4pm
Venue: CQT Seminar Room, S150315
Speaker: Fernando Pastawski, Institute for Quantum Information and Matter (IQIM)
In this talk, I will explore the recent connection between two profound ideas, quantum error correction and holography. The first, represents the realization that reliable quantum information processing could be achieved from imperfect physical components. The second, is a duality between two physical systems on different spatial dimensions which may be identified leading to the exact same predictions. Notably, only one of the two systems explicit includes gravitational features. Recently, quantum information has emerged as a natural tool to relate these two descriptions. As such, concepts familiar to quantum information scientists such as entanglement, compression and quantum error correction are playing important roles in understanding this duality. Conversely, the holographic duality is proposing a new lens through which to explore aspects of quantum error correction. In this talk, I will introduce some of the properties imposed by holography on corresponding quantum errorcorrecting codes, describe explicit tensor network codes which exhibit some of these properties and explore the implications of holographic predictions from a codetheoretic perspective.
Date: 23 March 2017, 4pm
Venue: CQT Seminar Room, S150315
Speaker: Vlatko Vedral, CQT, NUS
Quantum mechanics is commonly said to be a theory of microscopic things: molecules, atoms, subatomic particles. Most physicists, though, think it applies to everything, no matter what the size. The reason its distinctive features tend to be hidden is not a simple matter of scale. Over the past few years experimentalists have seen quantum effects in a growing number of macroscopic systems. The quintessential quantum effect, entanglement, can even occur in large systems as well as warm ones  including living organisms  even though molecular jiggling might be expected to disrupt entanglement.
I will discuss how techniques from information theory, quantum and statistical physics, can all be combined to elucidate the physics of macroscopic objects. Can it be that part of the macroscopic world is quantum, while the rest is, in some sense, classical? This question is also of fundamental importance to the development of future quantum technologies, whose behavior takes place invariably in the macroscopic nonequilibrium quantum regime.
I will discuss the concept of quantum macroscopicity and argue that it should be quantified in terms of coherence based on a set of conditions that should be satisfied by any measure of macroscopic coherence. I will show that this enables a rigorous justification of a previously proposed measure of macroscopicity based on the quantum Fisher information. This might shed new light on the standard Schrödinger cat type interference experiment that is meant to demonstrate the existence of macroscopic superpositions and entanglement.
Date: 27 April 2017, 4pm
Venue: CQT Seminar Room, S150315
Speaker: Valerio Scarani, CQT, NUS
Since its formulation in 1964, Bell's theorem has been classified under "foundations of physics". Ekert's 1991 attempt to relate it to an applied task, quantum cryptography, was quenched by an approach that relied on a different basis and was allegedly equivalent.
Ekert's intuition was finally vindicated with the discovery of "deviceindependent certification" of quantum devices. In this colloquium, I shall revisit the tortuous history of that discovery and mention some of the subsequent results.
Some references that review this topic:
V. Scarani, Acta Physica Slovaca 62, 347 (2012) [https://arxiv.org/abs/1303.3081]
N. Brunner et al., Rev. Mod. Phys. 86, 419 (2014) [https://arxiv.org/abs/1303.2849]
S. Pironio et al., New J. Phys. 18, 100202 (2016) [http://iopscience.iop.org/13672630/focus/FocusonDeviceIndependentQuantumInformation]