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Author(s): Nicolò Defenu, Tilman Enss, Michael Kastner, and Giovanna Morigi

Slow quenches of the magnetic field across the paramagnetic-ferromagnetic phase transition of spin systems produce heat. In systems with short-range interactions the heat exhibits universal power-law scaling as a function of the quench rate, known as Kibble-Zurek scaling. In this work we analyze slo...

[Phys. Rev. Lett. 121, 240403] Published Fri Dec 14, 2018

Author(s): A. E. Allahverdyan and D. Karakhanyan

The problem of defining work done on an electromagnetic field (EMF) via moving charges does not have a ready solution, because the standard Hamiltonian of an EMF—whose time derivative should define the work according to the first law—is not gauge invariant. This limits applications of statistical me...

[Phys. Rev. Lett. 121, 240602] Published Fri Dec 14, 2018

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Author(s): J. J. W. H. Sørensen, M. Dalgaard, A. H. Kiilerich, K. Mølmer, and J. F. Sherson

We introduce an efficient iterative method to prepare a target state in Hilbert spaces with high dimensionality using a combination of unitary evolution, measurements, and quantum Zeno dynamics. The latter confines the evolution within Zeno subspaces of decreasing size. This gives an exponential spe...

[Phys. Rev. A 98, 062317] Published Fri Dec 14, 2018

Author(s): Ulysse Chabaud, Eleni Diamanti, Damian Markham, Elham Kashefi, and Antoine Joux

We present a scheme for a universal device which can be programed by quantum states to approximate a chosen projective measurement to a given precision. Our scheme can be viewed as an extension of the swap test to the instance where one state is supplied many times. As such, it has many potential ap...

[Phys. Rev. A 98, 062318] Published Fri Dec 14, 2018

Author(s): Wen-Hao Zhang, Geng Chen, Xing-Xiang Peng, Xiang-Jun Ye, Peng Yin, Ya Xiao, Zhi-Bo Hou, Ze-Di Cheng, Yu-Chun Wu, Jin-Shi Xu, Chuan-Feng Li, and Guang-Can Guo

Self-testing is a method with which a classical user can certify the state and measurements of quantum systems in a device-independent way. In particular, self-testing of entangled states is of great importance in quantum information processing. An understandable example is that the maximal violatio...

[Phys. Rev. Lett. 121, 240402] Published Thu Dec 13, 2018

Author(s): Sushant Saryal, Juliane U. Klamser, Tridib Sadhu, and Deepak Dhar

There is a misconception, widely shared among physicists, that the equilibrium free energy of a one-dimensional classical model with strictly finite-ranged interactions, and at nonzero temperatures, cannot show any singularities as a function of the coupling constants. In this Letter, we discuss an ...

[Phys. Rev. Lett. 121, 240601] Published Thu Dec 13, 2018

The complex Langevin (CL) method sometimes shows convergence to the wrong limit, even though the

Schwinger–Dyson equations (SDE) are fulfilled. We analyze this problem in a more general context for

the case of one complex variable. We prove a theorem that shows that under rather general conditions

not only the equilibrium measure of CL but any linear functional satisfying the SDE on a space of

test functions is given by a linear combination of integrals along paths connecting the zeroes of

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Several integrable semi-discretizations are known in the literature for the massive Thirring system

in characteristic coordinates. We present for the first time an integrable semi-discretization of

the massive Thirring system in laboratory coordinates. Our approach relies on the relation between

the continuous massive Thirring system and the Ablowitz–Ladik lattice. In particular, we derive the

Lax pair for the integrable semi-discretization of the massive Thirring system by combining together

For open systems subjected to external magnetic fields, relations between the statistical cumulants

of their fluctuating currents and their response coefficients are established at arbitrary orders in

the deviations from equilibrium, as a consequence of microreversibility. These relations are

systematically deduced from the extension of the fluctuation relation for this class of systems, and

analyzed by using methods developed in Barbier and Gaspard (2018 J. Phys. A: Math. Theor . 51

Flory–Huggins theory (Flory 1942 J. Chem. Phys . 10 51–61; Huggins 1942 J. Am. Chem. Soc . 64

2716–8) is a mean field theory for modelling the free energy of dense polymer solutions and polymer

melts. In this paper we use Flory–Huggins theory as a model of a dense two-dimensional self-avoiding

walk compressed in a square in the square lattice. The theory describes the free energy of the walk

well, and we estimate the Flory interaction parameter of the walk to be ##IMG##