scholarly journals Alternative Uses for Quantum Systems and Devices

Symmetry ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 462 ◽  
Author(s):  
Orchidea Lecian
Keyword(s):  
Planck Scale ◽  
Quantum Systems ◽  
Optical Systems ◽  
Flat Spacetime ◽  
Quantum Optical ◽  
New Particles ◽  
Planck Scale Physics

Quantum optical systems and devices were analyzed to verify theories both predicting new particles on flat spacetime, and for the verification of Planck-scale physics for cosmological investigation.

scholarly journals Gaussian Quantum Trajectories for the Variational Simulation of Open Quantum-Optical Systems

2018 ◽  
Vol 8 (9) ◽  
pp. 1427 ◽  
Author(s):  
Wouter Verstraelen ◽  
Michiel Wouters
Keyword(s):  
Open Quantum Systems ◽  
Computational Cost ◽  
System Size ◽  
Quantum Systems ◽  
Optical Systems ◽  
Quantum Trajectory ◽  
Quantum Trajectories ◽  
Open Quantum ◽  
Quantum Optical ◽  
Bistability Regime

We construct a class of variational methods for the study of open quantum systems based on Gaussian ansatzes for the quantum trajectory formalism. Gaussianity in the conjugate position and momentum quadratures is distinguished from Gaussianity in density and phase. We apply these methods to a driven-dissipative Kerr cavity where we study dephasing and the stationary states throughout the bistability regime. Computational cost proves to be similar to the Truncated Wigner Approximation (TWA) method, with at most quadratic scaling in system size. Meanwhile, strong correspondence with the numerically-exact trajectory description is maintained so that these methods contain more information on the ensemble constitution than TWA and can be more robust.

scholarly journals Quantum-optical tests of Planck-scale physics

2018 ◽  
Vol 97 (6) ◽  
Author(s):  
Shreya P. Kumar ◽  
Martin B. Plenio
Keyword(s):  
Planck Scale ◽  
Quantum Optical ◽  
Planck Scale Physics

scholarly journals Transport of pseudothermal photons through an anharmonic cavity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dmitriy S. Shapiro
Keyword(s):  
Pauli Principle ◽  
Optical Systems ◽  
Frequency Noise ◽  
Continuous Transition ◽  
Noise Current ◽  
Nonperturbative Solution ◽  
Occupation Numbers ◽  
Fundamental Reason ◽  
The Rich ◽  
Quantum Optical

AbstractUnder nonequilibrium conditions, quantum optical systems reveal unusual properties that might be distinct from those in condensed matter. The fundamental reason is that photonic eigenstates can have arbitrary occupation numbers, whereas in electronic systems these are limited by the Pauli principle. Here, we address the steady-state transport of pseudothermal photons between two waveguides connected through a cavity with Bose–Hubbard interaction between photons. One of the waveguides is subjected to a broadband incoherent pumping. We predict a continuous transition between the regimes of Lorentzian and Gaussian chaotic light emitted by the cavity. The rich variety of nonequilibrium transport regimes is revealed by the zero-frequency noise. There are three limiting cases, in which the noise-current relation is characterized by a power-law, $$S\propto J^\gamma$$ S ∝ J γ . The Lorentzian light corresponds to Breit-Wigner-like transmission and $$\gamma =2$$ γ = 2 . The Gaussian regime corresponds to many-body transport with the shot noise ($$\gamma =1$$ γ = 1 ) at large currents; at low currents, however, we find an unconventional exponent $$\gamma =3/2$$ γ = 3 / 2 indicating a nontrivial interplay between multi-photon transitions and incoherent pumping. The nonperturbative solution for photon dephasing is obtained in the framework of the Keldysh field theory and Caldeira-Leggett effective action. These findings might be relevant for experiments on photon blockade in superconducting qubits, thermal states transfer, and photon statistics probing.

scholarly journals Searching for traces of Planck-scale physics with high energy neutrinos

2015 ◽  
Vol 91 (4) ◽  
Author(s):  
Floyd W. Stecker ◽  
Sean T. Scully ◽  
Stefano Liberati ◽  
David Mattingly
Keyword(s):  
Planck Scale ◽  
High Energy ◽  
High Energy Neutrinos ◽  
Planck Scale Physics

scholarly journals Topological protection of biphoton states

Science ◽  
2018 ◽  
Vol 362 (6414) ◽  
pp. 568-571 ◽  
Author(s):  
Andrea Blanco-Redondo ◽  
Bryn Bell ◽  
Dikla Oren ◽  
Benjamin J. Eggleton ◽  
Mordechai Segev
Keyword(s):  
Quantum Information ◽  
Thermal Environment ◽  
Propagation Constant ◽  
Quantum Systems ◽  
Quantum Gates ◽  
Scattering Loss ◽  
Spatial Features ◽  
Quantum Optical ◽  
Nontrivial Topology ◽  
Large Quantum

The robust generation and propagation of multiphoton quantum states are crucial for applications in quantum information, computing, and communications. Although photons are intrinsically well isolated from the thermal environment, scaling to large quantum optical devices is still limited by scattering loss and other errors arising from random fabrication imperfections. The recent discoveries regarding topological phases have introduced avenues to construct quantum systems that are protected against scattering and imperfections. We experimentally demonstrate topological protection of biphoton states, the building block for quantum information systems. We provide clear evidence of the robustness of the spatial features and the propagation constant of biphoton states generated within a nanophotonics lattice with nontrivial topology and propose a concrete path to build robust entangled states for quantum gates.

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