9 research outputs found
Photonic quantum information processing: a review
Photonic quantum technologies represent a promising platform for several
applications, ranging from long-distance communications to the simulation of
complex phenomena. Indeed, the advantages offered by single photons do make
them the candidate of choice for carrying quantum information in a broad
variety of areas with a versatile approach. Furthermore, recent technological
advances are now enabling first concrete applications of photonic quantum
information processing. The goal of this manuscript is to provide the reader
with a comprehensive review of the state of the art in this active field, with
a due balance between theoretical, experimental and technological results. When
more convenient, we will present significant achievements in tables or in
schematic figures, in order to convey a global perspective of the several
horizons that fall under the name of photonic quantum information.Comment: 36 pages, 6 figures, 634 references. Updated version with minor
changes and extended bibliograph
Single ring resonator spectral information elaboration via neural network algorithm as combined spectrometer device
Simple spectrometer based on a waveguide microring resonator with neural network data analysis
Temperature-drift-immune wavelength meter based on an integrated micro-ring resonator
Team Raf Van de PlasImPhys/Quantitative Imagin
Multi‐Level Electro‐Thermal Switching of Optical Phase‐Change Materials Using Graphene
Reconfigurable photonic systems featuring minimal power consumption are
crucial for integrated optical devices in real-world technology. Current active
devices available in foundries, however, use volatile methods to modulate
light, requiring a constant supply of power and significant form factors.
Essential aspects to overcoming these issues are the development of nonvolatile
optical reconfiguration techniques which are compatible with on-chip
integration with different photonic platforms and do not disrupt their optical
performances. In this paper, a solution is demonstrated using an optoelectronic
framework for nonvolatile tunable photonics that employs undoped-graphene
microheaters to thermally and reversibly switch the optical phase-change
material GeSbSeTe (GSST). An in-situ Raman spectroscopy method
is utilized to demonstrate, in real-time, reversible switching between four
different levels of crystallinity. Moreover, a 3D computational model is
developed to precisely interpret the switching characteristics, and to quantify
the impact of current saturation on power dissipation, thermal diffusion, and
switching speed. This model is used to inform the design of nonvolatile active
photonic devices; namely, broadband SiN integrated photonic circuits
with small form-factor modulators and reconfigurable metasurfaces displaying
2 phase coverage through neural-network-designed GSST meta-atoms. This
framework will enable scalable, low-loss nonvolatile applications across a
diverse range of photonics platforms
Quantum photo-thermodynamics on a programmable photonic quantum processor
One of the core questions of quantum physics is how to reconcile the unitary
evolution of quantum states, which is information-preserving and
time-reversible, with the second law of thermodynamics, which is neither. The
resolution to this paradox is to recognize that global unitary evolution of a
multi-partite quantum state causes the state of local subsystems to evolve
towards maximum-entropy states. In this work, we experimentally demonstrate
this effect in linear quantum optics by simultaneously showing the convergence
of local quantum states to a generalized Gibbs ensemble constituting a
maximum-entropy state under precisely controlled conditions, while using a new,
efficient certification method to demonstrate that the state retains global
purity. Our quantum states are manipulated by a programmable integrated
photonic quantum processor, which simulates arbitrary non-interacting
Hamiltonians, demonstrating the universality of this phenomenon. Our results
show the potential of photonic devices for quantum simulations involving
non-Gaussian states