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https://quantarei.wordpress.com
quantum science facts and ideas flowing from the University of Nottingham (UK)Fri, 18 Aug 2017 10:57:07 +0000hourly1http://wordpress.com/Comment on Computers designing quantum optics experiments by The Entanglement picture | quanta rei
https://quantarei.wordpress.com/2017/04/14/computers-designing-quantum-optics-experiments/comment-page-1/#comment-107
Fri, 18 Aug 2017 10:57:07 +0000http://quantarei.wordpress.com/?p=1480#comment-107[…] I won’t bring the Entanglement picture along with me – too much travel for it already – but I will be more than happy to talk about it and in general about the entangling relationship between quantum science and visual arts (see another example in this past blog post). […]

]]>Comment on Tangram puzzles and the cost of calculating entanglement by Do not get discouraged by the struggles of academia. There are plenty of success stories! | quanta rei
https://quantarei.wordpress.com/2016/04/08/tangram-puzzles-and-the-cost-of-calculating-entanglement/comment-page-1/#comment-72
Fri, 12 May 2017 09:00:07 +0000http://quantarei.wordpress.com/?p=201#comment-72[…] I am fascinated by various types of problems. Sometimes, I find it satisfactory to complete the proof of a rather abstract mathematical theorem, which has nonetheless concrete applications in a seemingly unrelated branches of physics. For example, applications of linear algebra and symplectic geometry tools to the characterisation of quantum correlations in harmonic systems are very appealing to me, see e.g. this recent Letter on J. Phys. A and its follow-ups. I am progressively more attracted towards questions challenging the conventional beliefs of quantum information theory, such as where to draw the line between useful and useless resources to demonstrate a quantum supremacy over classical schemes. Sometimes, on the other hand, I like to think of a very concrete problem, such as the performance optimisation of a practical device. In general, whenever a problem admits a neat analytical solution, this makes me particularly happy, but I often resort to numerical explorations in order to guess the solution in the first place. Then, it is usually a challenge for my junior collaborators to prove my intuition right. There have been cases where my intuition failed spectacularly, and investigating such failures turned out to spark a whole new series of interesting questions. This happened e.g. when considering a particular “monogamy” inequality for multipartite entanglement which I had been conjecturing for many years, whose hard-to-find violations eventually revealed a new method to quantify entanglement exactly by simple methods of Euclidean geometry. You can read more about this on my blog. […]

]]>Comment on Tangram puzzles and the cost of calculating entanglement by “Do not get discouraged by the struggles of academia. There are plenty of success stories!” – an interview with Professor Gerardo Adesso – JPhys+
https://quantarei.wordpress.com/2016/04/08/tangram-puzzles-and-the-cost-of-calculating-entanglement/comment-page-1/#comment-71
Fri, 12 May 2017 07:31:04 +0000http://quantarei.wordpress.com/?p=201#comment-71[…] I am fascinated by various types of problems. Sometimes, I find it satisfactory to complete the proof of a rather abstract mathematical theorem, which has nonetheless concrete applications in a seemingly unrelated branches of physics. For example, applications of linear algebra and symplectic geometry tools to the characterisation of quantum correlations in harmonic systems are very appealing to me, see e.g. this recent Letter on J. Phys. A and its follow-ups. I am progressively more attracted towards questions challenging the conventional beliefs of quantum information theory, such as where to draw the line between useful and useless resources to demonstrate a quantum supremacy over classical schemes. Sometimes, on the other hand, I like to think of a very concrete problem, such as the performance optimisation of a practical device. In general, whenever a problem admits a neat analytical solution, this makes me particularly happy, but I often resort to numerical explorations in order to guess the solution in the first place. Then, it is usually a challenge for my junior collaborators to prove my intuition right. There have been cases where my intuition failed spectacularly, and investigating such failures turned out to spark a whole new series of interesting questions. This happened e.g. when considering a particular “monogamy” inequality for multipartite entanglement which I had been conjecturing for many years, whose hard-to-find violations eventually revealed a new method to quantify entanglement exactly by simple methods of Euclidean geometry. You can read more about this on my blog. […]

]]>Comment on Of interference: Alice and the Zombie Cat by Understanding resources in the quantum world | quanta rei
https://quantarei.wordpress.com/2015/09/19/of-interference-alice-and-the-zombie-cat/comment-page-1/#comment-59
Thu, 27 Apr 2017 19:31:05 +0000http://quantarei.wordpress.com/?p=30#comment-59[…] In this example we cross into the realm of quantum mechanics and consider the resource of quantum entanglement (discussed in more detail in my previous post as well as our post on monogamy and faithfulness). Our physical system now consists of a collection of quantum objects that we call qubits. A qubit, short for a quantum bit, is the quantum analogue of a bit, which represents a system that can only exist in two distinct states (think, for example, of the faces of a coin). What makes a qubit “quantum” is that it can actually exist in an infinite number of possible states. However, if we then look at the qubit by observing it in a laboratory, we find that it collapses onto one of two possible states. Have a further investigation of quantum superposition, wave function collapse, and the infamous Schrödinger’s cat thought experiment for more information (as well as our short story Alice and the Zombie Cat). […]

]]>Comment on Would you rather be monogamous or faithful? by Understanding resources in the quantum world | quanta rei
https://quantarei.wordpress.com/2016/09/14/would-you-rather-be-monogamous-or-faithful/comment-page-1/#comment-58
Thu, 27 Apr 2017 19:31:00 +0000http://quantarei.wordpress.com/?p=861#comment-58[…] of quantum entanglement (discussed in more detail in my previous post as well as our post on monogamy and faithfulness). Our physical system now consists of a collection of quantum objects that we call qubits. A qubit, […]

]]>Comment on So, what are you researching? Connections between quantum entanglement and metrology by Understanding resources in the quantum world | quanta rei
https://quantarei.wordpress.com/2015/11/02/so-what-are-you-researching-1-connections-between-quantum-entanglement-and-metrology/comment-page-1/#comment-57
Thu, 27 Apr 2017 19:30:57 +0000http://quantarei.wordpress.com/?p=69#comment-57[…] of quantum mechanics and consider the resource of quantum entanglement (discussed in more detail in my previous post as well as our post on monogamy and faithfulness). Our physical system now consists of a […]

]]>Comment on Of interference: Alice and the Zombie Cat by Computers designing quantum optics experiments | quanta rei
https://quantarei.wordpress.com/2015/09/19/of-interference-alice-and-the-zombie-cat/comment-page-1/#comment-56
Fri, 14 Apr 2017 17:26:50 +0000http://quantarei.wordpress.com/?p=30#comment-56[…] entangled states, states with a large quantum Fisher information, and the preposterously named zombie cat states and three-headed cat […]

]]>Comment on So, what are you researching? Connections between quantum entanglement and metrology by Computers designing quantum optics experiments | quanta rei
https://quantarei.wordpress.com/2015/11/02/so-what-are-you-researching-1-connections-between-quantum-entanglement-and-metrology/comment-page-1/#comment-55
Fri, 14 Apr 2017 17:26:48 +0000http://quantarei.wordpress.com/?p=69#comment-55[…] states can exhibit bizarre but powerful properties, such as being in a superposition or containing correlations not possible in classical physics. If these properties can be controlled, then they can be […]

]]>Comment on A somewhat coherent post on a robust idea by Computers designing quantum optics experiments | quanta rei
https://quantarei.wordpress.com/2016/04/13/a-somewhat-coherent-post-on-a-robust-idea/comment-page-1/#comment-54
Fri, 14 Apr 2017 17:26:46 +0000http://quantarei.wordpress.com/?p=195#comment-54[…] states can exhibit bizarre but powerful properties, such as being in a superposition or containing correlations not possible in classical physics. If these properties can be […]

]]>Comment on Can we freeze something at room temperature? Yes, quantum coherence! by quronet
https://quantarei.wordpress.com/2016/12/29/can-we-freeze-something-at-room-temperature-yes-quantum-coherence/comment-page-1/#comment-45
Thu, 29 Dec 2016 20:24:27 +0000http://quantarei.wordpress.com/?p=1425#comment-45Sorry, But as you said in a closed system the quantum systems can be protected from decoherence, But on visualizing things It is quite different or may that is negligible(so one might ignore that). I was just asking that won’t Quantum fluctuations matters inside the system and their re-vibration within them and with the edge of the system.