Zobrazeno 1 - 10
of 46
pro vyhledávání: '"McGinley, Max"'
We analyse the entanglement structure of states generated by random constant-depth two-dimensional quantum circuits, followed by projective measurements of a subset of sites. By deriving a rigorous lower bound on the average entanglement entropy of s
Externí odkaz:
http://arxiv.org/abs/2410.23248
Publikováno v:
Phys. Rev. B 109, 075108 (2024)
We study the behaviour of linear and nonlinear spectroscopic quantities in two-dimensional topologically ordered systems, which host anyonic excitations exhibiting fractional statistics. We highlight the role that braiding phases between anyons have
Externí odkaz:
http://arxiv.org/abs/2402.06484
Autor:
McGinley, Max
Publikováno v:
PRX Quantum 5, 020347 (2024)
We address how one can empirically infer properties of quantum states generated by dynamics involving measurements. Our focus is on many-body settings where the number of measurements is extensive, making brute-force approaches based on postselection
Externí odkaz:
http://arxiv.org/abs/2310.04156
Autor:
Leontica, Sebastian, McGinley, Max
We introduce a continuous time model of many-body quantum dynamics based on infinitesimal random unitary operations, combined with projective measurements. We consider purification dynamics in this model, where the system is initialized in a mixed st
Externí odkaz:
http://arxiv.org/abs/2308.12003
Autor:
McGinley, Max, Fava, Michele
Publikováno v:
Phys. Rev. Lett. 131, 160601 (2023)
We introduce a method that allows one to infer many properties of a quantum state -- including nonlinear functions such as R\'enyi entropies -- using only global control over the constituent degrees of freedom. In this protocol, the state of interest
Externí odkaz:
http://arxiv.org/abs/2212.02543
Publikováno v:
Phys. Rev. Lett. 132, 066702 (2024)
We show that the presence of anyons in the excitation spectrum of a two-dimensional system can be inferred from nonlinear spectroscopic quantities. In particular, we consider pump-probe spectroscopy, where a sample is irradiated by two light pulses w
Externí odkaz:
http://arxiv.org/abs/2210.16249
Publikováno v:
Phys. Rev. A 106, 012441 (2022)
We develop techniques to probe the dynamics of quantum information, and implement them experimentally on an IBM superconducting quantum processor. Our protocols adapt shadow tomography for the study of time evolution channels rather than of quantum s
Externí odkaz:
http://arxiv.org/abs/2202.05132
Publikováno v:
Phys. Rev. Lett. 129, 090404 (2022)
We introduce a model of non-unitary quantum dynamics that exhibits infinitely long-lived discrete spatiotemporal order robust against any unitary or dissipative perturbation. Ergodicity is evaded by combining a sequence of projective measurements wit
Externí odkaz:
http://arxiv.org/abs/2111.02499
Kramers' degeneracy theorem underpins many interesting effects in quantum systems with time-reversal symmetry. We show that the generator of dynamics for Markovian open fermionic systems can exhibit an analogous degeneracy, protected by a combination
Externí odkaz:
http://arxiv.org/abs/2105.02888
Autor:
McGinley, Max, Cooper, Nigel R.
Publikováno v:
Phys. Rev. B 103, 235164 (2021)
We demonstrate that electrostatic interactions between helical electrons at the edge of a quantum spin Hall insulator and a dynamical impurity can induce quasi-elastic backscattering. Modelling the impurity as a two-level system, we show that transit
Externí odkaz:
http://arxiv.org/abs/2009.14650