Zobrazeno 1 - 10
of 232
pro vyhledávání: '"Chalker, J. T."'
We study operator dynamics in many-body quantum systems, focusing on generic features of systems which are ergodic, spatially extended, and lack conserved densities, as exemplified by spin chains with Floquet time evolution. To characterise dynamics
Externí odkaz:
http://arxiv.org/abs/2312.14234
Publikováno v:
J Stat Phys 191, 55 (2024)
We study the competition between Haar-random unitary dynamics and measurements for unstructured systems of qubits. For projective measurements, we derive various properties of the statistical ensemble of Kraus operators analytically, including the pu
Externí odkaz:
http://arxiv.org/abs/2312.09216
Publikováno v:
Phys. Rev. X 14, 031029 (2024)
We consider the statistical properties of eigenstates of the time-evolution operator in chaotic many-body quantum systems. Our focus is on correlations between eigenstates that are specific to spatially extended systems and that characterise entangle
Externí odkaz:
http://arxiv.org/abs/2309.12982
Publikováno v:
Phys. Rev. B 104, 184203 (2021)
By varying the disorder realisation in the many-body localised (MBL) phase, we investigate the influence of resonances on spectral properties. The standard theory of the MBL phase is based on the existence of local integrals of motion (LIOM), and eig
Externí odkaz:
http://arxiv.org/abs/2107.12387
Autor:
Garratt, S. J., Chalker, J. T.
Publikováno v:
Phys. Rev. Lett. 127, 026802 (2021)
We present a framework in which the transition between a many-body localised (MBL) phase and an ergodic one is symmetry breaking. We consider random Floquet spin chains, expressing their averaged spectral form factor (SFF) as a function of time in te
Externí odkaz:
http://arxiv.org/abs/2012.11580
Publikováno v:
Phys. Rev. Research 3, 023118 (2021)
We consider the spectral statistics of the Floquet operator for disordered, periodically driven spin chains in their quantum chaotic and many-body localized phases (MBL). The spectral statistics are characterized by the traces of powers $t$ of the Fl
Externí odkaz:
http://arxiv.org/abs/2012.05295
Autor:
Garratt, S. J., Chalker, J. T.
Publikováno v:
Phys. Rev. X 11, 021051 (2021)
We study many-body quantum dynamics using Floquet quantum circuits in one space dimension as simple examples of systems with local interactions that support ergodic phases. Physical properties can be expressed in terms of multiple sums over Feynman h
Externí odkaz:
http://arxiv.org/abs/2008.01697
Publikováno v:
Phys. Rev. Lett. 127, 127201 (2021)
We exhibit an exactly solvable example of a SU(2) symmetric Majorana spin liquid phase, in which quenched disorder leads to random-singlet phenomenology. More precisely, we argue that a strong-disorder fixed point controls the low temperature suscept
Externí odkaz:
http://arxiv.org/abs/2006.16987
Publikováno v:
Phys. Rev. Lett. 125, 086601 (2020)
Network models for equilibrium integer quantum Hall (IQH) transitions are described by unitary scattering matrices, that can also be viewed as representing non-equilibrium Floquet systems. The resulting Floquet bands have zero Chern number, and are i
Externí odkaz:
http://arxiv.org/abs/2002.04058
Publikováno v:
Phys. Rev. Research 2, 033347 (2020)
We set out a general protocol for steering the state of a quantum system from an arbitrary initial state towards a chosen target state by coupling it to auxiliary quantum degrees of freedom. The protocol requires multiple repetitions of an elementary
Externí odkaz:
http://arxiv.org/abs/1912.04292