12 research outputs found
Restoration of the non-Hermitian bulk-boundary correspondence via topological amplification
Non-Hermitian (NH) lattice Hamiltonians display a unique kind of energy gap
and extreme sensitivity to boundary conditions. Due to the NH skin effect, the
separation between edge and bulk states is blurred and the (conventional)
bulk-boundary correspondence is lost. Here, we restore the bulk-boundary
correspondence for the most paradigmatic class of NH Hamiltonians, namely those
with one complex band and without symmetries. We obtain the desired NH
Hamiltonian from the (mean-field) unconditional evolution of driven-dissipative
cavity arrays, in which NH terms -- in the form of non-reciprocal hopping
amplitudes, gain and loss -- are explicitly modeled via coupling to (engineered
and non-engineered) reservoirs. This approach removes the arbitrariness in the
definition of the topological invariant, as point-gapped spectra differing by a
complex-energy shift are not treated as equivalent; the origin of the complex
plane provides a common reference (base point) for the evaluation of the
topological invariant. This implies that topologically non-trivial Hamiltonians
are only a strict subset of those with a point gap and that the NH skin effect
does not have a topological origin. We analyze the NH Hamiltonians so obtained
via the singular value decomposition, which allows to express the NH
bulk-boundary correspondence in the following simple form: an integer value
of the topological invariant defined in the bulk corresponds to singular vectors exponentially localized at the system edge under
open boundary conditions, in which the sign of determines which edge.
Non-trivial topology manifests as directional amplification of a coherent input
with gain exponential in system size. Our work solves an outstanding problem in
the theory of NH topological phases and opens up new avenues in topological
photonics.Comment: 21 pages, 10 figure
Correspondence between non-Hermitian topology and directional amplification in the presence of disorder
In order for non-Hermitian (NH) topological effects to be relevant for
practical applications, it is necessary to study disordered systems. In the
absence of disorder, certain driven-dissipative cavity arrays with engineered
non-local dissipation display directional amplification when associated with a
non-trivial winding number of the NH dynamic matrix. In this work, we show
analytically that the correspondence between NH topology and directional
amplification holds even in the presence of disorder. When a system with
non-trivial topology is tuned close to the exceptional point, perfect
non-reciprocity (quantified by a vanishing reverse gain) is preserved for
arbitrarily strong on-site disorder. For bounded disorder, we derive simple
bounds for the probability distribution of the scattering matrix elements.
These bounds show that the essential features associated with non-trivial NH
topology, namely that the end-to-end forward (reverse) gain grows (is
suppressed) exponentially with system size, are preserved in disordered
systems. NH topology in cavity arrays is robust and can thus be exploited for
practical applications.Comment: 5+5 pages, 4+2 figures. Comments welcom
Quadrature nonreciprocity: unidirectional bosonic transmission without breaking time-reversal symmetry
Nonreciprocity means that the transmission of a signal depends on its
direction of propagation. Despite vastly different platforms and underlying
working principles, the realisations of nonreciprocal transport in linear,
time-independent systems rely on Aharonov-Bohm interference among several
pathways and require breaking time-reversal symmetry. Here we extend the notion
of nonreciprocity to unidirectional bosonic transport in systems with a
time-reversal symmetric Hamiltonian by exploiting interference between
beamsplitter (excitation preserving) and two-mode-squeezing (excitation
non-preserving) interactions. In contrast to standard nonreciprocity, this
unidirectional transport manifests when the mode quadratures are resolved with
respect to an external reference phase. Hence we dub this phenomenon quadrature
nonreciprocity. First, we experimentally demonstrate it in the minimal system
of two coupled nanomechanical modes orchestrated by optomechanical
interactions. Next, we develop a theoretical framework to characterise the
class of networks exhibiting quadrature nonreciprocity based on features of
their particle-hole graphs. In addition to unidirectionality, these networks
can exhibit an even-odd pairing between collective quadratures, which we
confirm experimentally in a four-mode system, and an exponential end-to-end
gain in the case of arrays of cavities. Our work opens up new avenues for
signal routing and quantum-limited amplification in bosonic systems.Comment: Includes: Main Text (7 pages, 4 figures), Methods & References (5
pages, 1 figure), Supplementary Information (14 pages, 2 figures
GABA receptor associated protein changes the electrostatic environment around the GABA type A receptor.
Funder: Science and Technology Facilities Council; Id: http://dx.doi.org/10.13039/501100000271We have performed fully atomistic molecular dynamics simulations of the intracellular domain of a model of the GABAA receptor with and without the GABA receptor associated protein (GABARAP) bound. We have also calculated the electrostatic potential due to the receptor, in the absence and presence of GABARAP. We find that GABARAP binding changes the electrostatic properties around the GABAA receptor and could lead to increased conductivity of chloride ions through the receptor. We also find that ion motions that would result in conducting currents are observed nearly twice as often when GABARAP binds. These results are consistent with data from electrophysiological experiments
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Topological framework for directional amplification in driven-dissipative cavity arrays
Funder: Winton Programme for the Physics of Sustainability (https://www.winton.phy.cam.ac.uk/)Abstract: Directional amplification, in which signals are selectively amplified depending on their propagation direction, has attracted much attention as key resource for applications, including quantum information processing. Recently, several, physically very different, directional amplifiers have been proposed and realized in the lab. In this work, we present a unifying framework based on topology to understand non-reciprocity and directional amplification in driven-dissipative cavity arrays. Specifically, we unveil a one-to-one correspondence between a non-zero topological invariant defined on the spectrum of the dynamic matrix and regimes of directional amplification, in which the end-to-end gain grows exponentially with the number of cavities. We compute analytically the scattering matrix, the gain and reverse gain, showing their explicit dependence on the value of the topological invariant. Parameter regimes achieving directional amplification can be elegantly obtained from a topological ‘phase diagram’, which provides a guiding principle for the design of both phase-preserving and phase-sensitive multimode directional amplifiers
Topological framework for directional amplification in driven-dissipative cavity arrays
Funder: Winton Programme for the Physics of Sustainability (https://www.winton.phy.cam.ac.uk/)Abstract: Directional amplification, in which signals are selectively amplified depending on their propagation direction, has attracted much attention as key resource for applications, including quantum information processing. Recently, several, physically very different, directional amplifiers have been proposed and realized in the lab. In this work, we present a unifying framework based on topology to understand non-reciprocity and directional amplification in driven-dissipative cavity arrays. Specifically, we unveil a one-to-one correspondence between a non-zero topological invariant defined on the spectrum of the dynamic matrix and regimes of directional amplification, in which the end-to-end gain grows exponentially with the number of cavities. We compute analytically the scattering matrix, the gain and reverse gain, showing their explicit dependence on the value of the topological invariant. Parameter regimes achieving directional amplification can be elegantly obtained from a topological ‘phase diagram’, which provides a guiding principle for the design of both phase-preserving and phase-sensitive multimode directional amplifiers
Recommended from our members
Topological framework for directional amplification in driven-dissipative cavity arrays
Funder: Winton Programme for the Physics of Sustainability (https://www.winton.phy.cam.ac.uk/)Abstract: Directional amplification, in which signals are selectively amplified depending on their propagation direction, has attracted much attention as key resource for applications, including quantum information processing. Recently, several, physically very different, directional amplifiers have been proposed and realized in the lab. In this work, we present a unifying framework based on topology to understand non-reciprocity and directional amplification in driven-dissipative cavity arrays. Specifically, we unveil a one-to-one correspondence between a non-zero topological invariant defined on the spectrum of the dynamic matrix and regimes of directional amplification, in which the end-to-end gain grows exponentially with the number of cavities. We compute analytically the scattering matrix, the gain and reverse gain, showing their explicit dependence on the value of the topological invariant. Parameter regimes achieving directional amplification can be elegantly obtained from a topological ‘phase diagram’, which provides a guiding principle for the design of both phase-preserving and phase-sensitive multimode directional amplifiers
Topological framework for directional amplification in driven-dissipative cavity arrays
In information processing applications, directional amplifiers are key components which can be realized in very different systems. Here, the authors present a theoretical framework based on the introduction of a topological invariant that helps to understand directional amplification in coupled cavity arrays