New graduate student: Nathan Myers Starting Fall 2018 Nathan Myers has joined the group as graduate student. His research will focus on the efficiency of quantum heat engines and their relevance for the frontiers of quantum thermodynamics. Welcome to the group! ]]> Starting Fall 2018 Nathan Myers has joined the group as graduate student. His research will focus on the efficiency of quantum heat engines and their relevance for the frontiers of quantum... Photo https://assets4-beta.my.umbc.edu/system/shared/attachments/0c1eaaccd7ac336c03a20019a4ac458e/69f84f31/news/000/078/781/4dc78ee9d84aeec573c4179447b5f17c/Myers_Nathan_sm.jpg?1537458882 https://beta.my.umbc.edu/api/v0/pixel/news/78781/guest@my.umbc.edu/398b6173d9702d648b938a9122e578ac/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 0 0 true Thu, 20 Sep 2018 11:54:46 -0400 New Paper: Physical Review A

Quantum Zeno effect in correlated qubits

Dominik Šafránek and Sebastian Deffner

Phys. Rev. A 98, 032308 (2018)

Near-term quantum hardware promises to achieve quantum supremacy. From a quantum dynamical point of view, however, it is not unambiguously clear whether fundamental peculiarities of quantum physics permit any arbitrary speedups in real time. We show that an only recently unveiled property of the quantum Fisher information has profound implications for the rate of possible quantum information processing. To this end, we analyze an exemplary and pedagogical example for a quantum computer consisting of a computational qubit and a quantum memory. We find that frequent interaction between memory and device exhibit the quantum Zeno effect. In a second part, we show that the Zeno effect can be prevented by carefully designing the correlations and interaction between single elements of the quantum memory. ]]> Quantum Zeno effect in correlated qubits Dominik Šafránek and Sebastian Deffner Phys. Rev. A 98, 032308 (2018) Near-term quantum hardware promises to achieve quantum supremacy. From a... https://beta.my.umbc.edu/api/v0/pixel/news/78496/guest@my.umbc.edu/8fa5eb57d03db34fc7acb5d352052710/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 1 0 true Mon, 10 Sep 2018 15:32:51 -0400 Mon, 10 Sep 2018 15:33:06 -0400 New Paper: Physical Review X

Jarzynski Equality for Driven Quantum Field Theories

Phys. Rev. X 8, 011033

Anthony Bartolotta and Sebastian Deffner


Since the middle of the last century, quantum field theory—a theoretical framework for describing subatomic particles in terms of fields—has served as our most fundamental description of nature. The theory has been rigorously tested and encompasses particle physics, cosmology, and condensed matter. Thermodynamics, however, remained largely stagnant until about two decades ago when fluctuation theorems broadened our understanding of systems operating far from equilibrium. These two bodies of research remain largely separate. Here, we extend the existing literature on fluctuation theorems to the realm of quantum field theory, vastly expanding the range of possible systems to which these theorems can be applied. In our work, we reconcile the sometimes conflicting nature of quantum fluctuation theorems and quantum field theory. Quantum fluctuation theorems aim to describe the behavior of systems over short time scales when subject to time-dependent driving, whereas quantum field theories are usually used to describe the long-time behavior of time-independent systems. We require new calculation techniques because existing methods in quantum field theory are inadequate for calculating the quantities of interest. This culminates in the calculation of closed-form expressions for the probability distribution of work performed by subjecting a particular quantum field theory to a time-dependent driving. From the quark-gluon plasma produced in particle accelerators to the relativistic charge carriers of graphene and to the inflation of the early Universe, nonequilibrium systems described by quantum field theories abound across a vast range of scales. This work opens the door for future applications of quantum fluctuation theorems to the study of this diverse group of systems. ]]> Jarzynski Equality for Driven Quantum Field Theories Phys. Rev. X 8, 011033 Anthony Bartolotta and Sebastian Deffner Since the middle of the last century, quantum field theory—a theoretical... https://journals.aps.org/prx/abstract/10.1103/PhysRevX.8.011033 https://beta.my.umbc.edu/api/v0/pixel/news/74343/guest@my.umbc.edu/0c2061fa671a2f5c6cf9608d89fa0df0/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 1 0 true Tue, 27 Feb 2018 16:05:41 -0500 Tue, 27 Feb 2018 16:20:37 -0500 New Paper: Quantum Science and Technology Precision thermometry and the quantum speed limit

Precision thermometry and the quantum speed limit


Steve Campbell, Marco G. Genoni, and Sebastian Deffner

Quantum Sci. Technol. 3, 025002 (2018)

We assess precision thermometry for an arbitrary single quantum system. For a d-dimensional harmonic system we show that the gap sets a single temperature that can be optimally estimated. Furthermore, we establish a simple linear relationship between the gap and this temperature, and show that the precision exhibits a quadratic relationship. We extend our analysis to explore systems with arbitrary spectra, showing that exploiting anharmonicity and degeneracy can greatly enhance the precision of thermometry. Finally, we critically assess the dynamical features of two thermometry protocols for a two level system. By calculating the quantum speed limit we find that, despite the gap fixing a preferred temperature to probe, there is no evidence of this emerging in the dynamical features. ]]> Precision thermometry and the quantum speed limit Steve Campbell, Marco G. Genoni, and Sebastian Deffner Quantum Sci. Technol. 3, 025002 (2018) We assess precision thermometry for an... https://beta.my.umbc.edu/api/v0/pixel/news/73670/guest@my.umbc.edu/c64b7c91c96655da1742c4980e55c7ba/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 0 0 true Mon, 05 Feb 2018 09:27:42 -0500 Mon, 05 Feb 2018 09:32:39 -0500 New article: The Conversation Quantum speed limit may put brakes on quantum computers Check it out! ]]> Check it out! https://theconversation.com/quantum-speed-limit-may-put-brakes-on-quantum-computers-89353 https://beta.my.umbc.edu/api/v0/pixel/news/73162/guest@my.umbc.edu/293459ac2ce4fac60053548fc0dad1ad/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 0 0 true Thu, 11 Jan 2018 20:58:47 -0500 The Academic Minute with Dr. Deffner Dr. Deffner featured on WAMC

A new, more secure computer is on the way to protect our most sensitive data.

Sebastian Deffner, assistant professor of physics at the University of Maryland Baltimore County, explores quantum supremacy and how it could keep our data safe in the future.

]]> A new, more secure computer is on the way to protect our most sensitive data. Sebastian Deffner, assistant professor of physics at the University of Maryland Baltimore County, explores quantum... https://academicminute.org/2017/12/sebastian-deffner-university-of-maryland-baltimore-county-quantum-supremacy/ https://beta.my.umbc.edu/api/v0/pixel/news/72729/guest@my.umbc.edu/039acf617970da22ba76a7b9d32b205f/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics https://assets2-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/xxlarge.jpg?1513008607 https://assets1-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/xlarge.jpg?1513008607 https://assets1-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/large.jpg?1513008607 https://assets4-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/medium.jpg?1513008607 https://assets2-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/small.jpg?1513008607 https://assets4-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/xsmall.jpg?1513008607 https://assets1-beta.my.umbc.edu/system/shared/thumbnails/news/000/072/729/aecbd04d7052bc60fc3bedbede337e2f/xxsmall.jpg?1513008607 1 0 true Mon, 11 Dec 2017 11:11:29 -0500 New Paper: Phys. Rev. E Kibble-Zurek scaling of the irreversible entropy production

Kibble-Zurek scaling of the irreversible entropy production

Sebastian Deffner

Phys. Rev. E 96 (2017) 052125

If a system is driven at finite rate through a phase transition by varying an intensive parameter, the order parameter shatters into finite domains. The Kibble-Zurek mechanism predicts the typical size of these domains, which are governed only by the rate of driving and the spatial and dynamical critical exponents. We show that also the irreversible entropy production fulfills a universal behavior, which however is determined by an additional critical exponent corresponding to the intensive control parameter. Our universal prediction is numerically tested in two systems exhibiting noise-induced phase transitions. ]]> Kibble-Zurek scaling of the irreversible entropy production Sebastian Deffner Phys. Rev. E 96 (2017) 052125 If a system is driven at finite rate through a phase transition by varying an... https://journals.aps.org/pre/abstract/10.1103/PhysRevE.96.052125 https://beta.my.umbc.edu/api/v0/pixel/news/72152/guest@my.umbc.edu/10a18bea9dee39ed03b1a14ff5c64e36/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 1 0 true Fri, 17 Nov 2017 07:46:06 -0500 Fri, 17 Nov 2017 07:46:37 -0500 New Paper: Heliyon

Demonstration of entanglement assisted invariance on IBM's quantum experience

Sebastian Deffner
Heliyon, 3 e00444 (2017) ]]> Demonstration of entanglement assisted invariance on IBM's quantum experience Sebastian Deffner Heliyon, 3 e00444 (2017) http://www.sciencedirect.com/science/article/pii/S2405844017319369 https://beta.my.umbc.edu/api/v0/pixel/news/71746/guest@my.umbc.edu/e442f2d121c569563df78c04cea61251/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 1 0 true Fri, 03 Nov 2017 13:55:24 -0400 Fri, 03 Nov 2017 13:57:39 -0400 New Paper: New Journal of Physics Quantum speed limits in phase space

Geometric quantum speed limits: a case for Wigner phase space

Sebastian Deffner
New J. Phys. 19, 103018 (2017)
The quantum speed limit is a fundamental upper bound on the speed of quantum evolution. However, the actual mathematical expression of this fundamental limit depends on the choice of a measure of distinguishability of quantum states. We show that quantum speed limits are qualitatively governed by the Schatten-p-norm of the generator of quantum dynamics. Since computing Schatten-p-norms can be mathematically involved, we then develop an alternative approach in Wigner phase space. We find that the quantum speed limit in Wigner space is fully equivalent to expressions in density operator space, but that the new bound is significantly easier to compute. Our results are illustrated for the parametric harmonic oscillator and for quantum Brownian motion. ]]> Geometric quantum speed limits: a case for Wigner phase space Sebastian Deffner New J. Phys. 19, 103018 (2017) The quantum speed limit is a fundamental upper bound on the speed of quantum... http://iopscience.iop.org/article/10.1088/1367-2630/aa83dc/meta https://beta.my.umbc.edu/api/v0/pixel/news/71371/guest@my.umbc.edu/2ef6bb60bd0fb51206270e686fb364c0/api/pixel Quantum Thermodynamics https://beta.my.umbc.edu/groups/quthermo https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/original.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxlarge.png?1502988446 https://assets4-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xlarge.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/large.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/medium.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/small.png?1502988446 https://assets1-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xsmall.png?1502988446 https://assets3-beta.my.umbc.edu/system/shared/avatars/groups/000/001/393/cfed54c41318d9b704a1ec1b884218b1/xxsmall.png?1502988446 Quantum Thermodynamics 1 0 true Mon, 23 Oct 2017 08:07:30 -0400 New Paper: Topical Review in J. Phys. A Quantum speed limits

Quantum speed limits: from Heisenberg's uncertainty principle to optimal quantum control


Sebastian Deffner and Steve Campbell
J. Phys. A: Math. Theor. 50, 453001 (2017)
One of the most widely known building blocks of modern physics is Heisenberg's indeterminacy principle. Among the different statements of this fundamental property of the full quantum mechanical nature of physical reality, the uncertainty relation for energy and time has a special place. Its interpretation and its consequences have inspired continued research efforts for almost a century. In its modern formulation, the uncertainty relation is understood as setting a fundamental bound on how fast any quantum system can evolve. In this Topical Review we describe important milestones, such as the Mandelstam-Tamm and the Margolus-Levitin bounds on the quantum speed limit, and summarise recent applications in a variety of current research fields -- including quantum information theory, quantum computing, and quantum thermodynamics amongst several others. To bring order and to provide an access point into the many different notions and concepts, we have grouped the various approaches into the minimal time approach and the geometric approach, where the former relies on quantum control theory, and the latter arises from measuring the distinguishability of quantum states. Due to the volume of the literature, this Topical Review can only present a snapshot of the current state-of-the-art and can never be fully comprehensive. Therefore, we highlight but a few works hoping that our selection can serve as a representative starting point for the interested reader.

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