# All

## Kinetic regimes in aggregating systems with spontaneous and collisional fragmentation

We analyze systems of clusters and interacting upon colliding—a collision between two clusters may
lead to merging or fragmentation—and we also investigate the influence of additional spontaneous
fragmentation events. We consider both closed systems in which the total mass remains constant and
open systems driven by a source of small-mass clusters. In closed systems, the size distribution of
aggregates approaches a steady state. For these systems the relaxation time and the steady state

## Experimental simulation of shift operators in a quantum processor

Author(s): Xiangyu Kong, Shijie Wei, Jingwei Wen, Tao Xin, and Gui-Lu Long
The ability to implement quantum operations plays a fundamental role in manipulating quantum systems. Creation and annihilation operators which transform one quantum state into another by adding or subtracting a particle are crucial in constructing the quantum description of many-body quantum theory...
[Phys. Rev. A 99, 042328] Published Mon Apr 22, 2019

## Inhibition of spreading in quantum random walks due to quenched Poisson-distributed disorder

We consider a quantum particle (walker) on a line that coherently chooses to jump to the left or right depending on the result of a toss of a quantum coin. The lengths of the jumps are considered to be independent and identically distributed quenched Poisson random variables. We find that the spread...
[Phys. Rev. A 99, 042329] Published Mon Apr 22, 2019

## Entanglement-assisted communication in the absence of shared reference frame

Author(s): Ali Beheshti, Sadegh Raeisi, and Vahid Karimipour
Alice wants to convey the value of a parameter to Bob with whom she does not share a reference frame. What physical object can she use for this task? Shall she encode this value into the angle between two physical vectors such as the angle between two spins? Can she benefit from using entanglement? ...
[Phys. Rev. A 99, 042330] Published Mon Apr 22, 2019

## Ballistic Spin Transport in a Periodically Driven Integrable Quantum System

Author(s): Marko Ljubotina, Lenart Zadnik, and Tomaž Prosen
We demonstrate ballistic spin transport of an integrable unitary quantum circuit, which can be understood either as a paradigm of an integrable periodically driven (Floquet) spin chain, or as a Trotterized anisotropic ($XXZ$) Heisenberg spin-$1/2$ model. We construct an analytic family of quasilocal...
[Phys. Rev. Lett. 122, 150605] Published Fri Apr 19, 2019

## Entanglement-Guided Search for Parent Hamiltonians

Author(s): X. Turkeshi, T. Mendes-Santos, G. Giudici, and M. Dalmonte
We introduce a method for the search of parent Hamiltonians of input wave functions based on the structure of their reduced density matrix. The two key elements of our recipe are an ansatz on the relation between the reduced density matrix and parent Hamiltonian that is exact at the field theory lev...
[Phys. Rev. Lett. 122, 150606] Published Fri Apr 19, 2019

## Generic Bound Coherence under Strictly Incoherent Operations

Author(s): Ludovico Lami, Bartosz Regula, and Gerardo Adesso
We compute analytically the maximal rates of distillation of quantum coherence under strictly incoherent operations (SIO) and physically incoherent operations (PIO), showing that they coincide for all states, and providing a complete description of the phenomenon of bound coherence. In particular, w...
[Phys. Rev. Lett. 122, 150402] Published Fri Apr 19, 2019

## Spontaneous generation of phononic entanglement in quantum dark-soliton qubits

Author(s): Muzzamal I. Shaukat, Eduardo V. Castro, and Hugo Terças
We show that entanglement between two solitary qubits in quasi-one-dimensional Bose-Einstein condensates can be spontaneously generated due to quantum fluctuations. Recently we have shown that dark solitons are an appealing platform for qubits thanks to their appreciable long lifetime. We investigat...
[Phys. Rev. A 99, 042326] Published Thu Apr 18, 2019

## Learning robust and high-precision quantum controls

Author(s): Re-Bing Wu, Haijin Ding, Daoyi Dong, and Xiaoting Wang
Robust and high-precision quantum control is extremely important but challenging for the functionalization of scalable quantum computation. In this paper, we show that this hard problem can be translated to a supervised machine learning task by thinking of the time-ordered quantum evolution as a lay...
[Phys. Rev. A 99, 042327] Published Thu Apr 18, 2019

## Optimal Probabilistic Work Extraction beyond the Free Energy Difference with a Single-Electron Device

Author(s): Olivier Maillet, Paolo A. Erdman, Vasco Cavina, Bibek Bhandari, Elsa T. Mannila, Joonas T. Peltonen, Andrea Mari, Fabio Taddei, Christopher Jarzynski, Vittorio Giovannetti, and Jukka P. Pekola
In very small systems like a single electron transistor, sometimes thermal fluctuations allow single shot extraction of work from the system beyond the bounds of the second law of thermodynamics.
[Phys. Rev. Lett. 122, 150604] Published Thu Apr 18, 2019