Results 91 to 100 of about 11,924,253 (266)

Optimizing the Choice of Spin-Squeezed States for Detecting and Characterizing Quantum Processes

Physical Review X, 2014
Quantum metrology uses quantum states with no classical counterpart to measure a physical quantity with extraordinary sensitivity or precision. Most such schemes characterize a dynamical process by probing it with a specially designed quantum state.
Lee A. Rozema, Dylan H. Mahler, Robin Blume-Kohout, Aephraim M. Steinberg   +3 more
doaj   +1 more source

Active learning with variational quantum circuits for quantum process tomography

Physical Review A
Quantum process tomography (QPT) is a fundamental tool for fully characterizing quantum systems. It relies on querying a set of quantum states as input to the quantum process. Previous QPT methods typically employ a straightforward strategy for randomly selecting quantum states, overlooking differences in informativeness among them.
Jiaqi Yang, Xiaohua Xu, Wei Xie
openaire   +2 more sources

Some Recent Progresses in Quantum Tomography Realized at INRIM

, 2013
We present some Quantum Tomography related results recently obtained in the Quantum Optics labs of the National Institute of Metrological Research (INRIM).
GRAMEGNA, MARCO, PIACENTINI, FABRIZIO, RUO BERCHERA, IVANO, M. Genovese, I. R. Berchera, G. Mingolla, TARALLI, EMANUELE, A. Migdall, I. P. Degiovanni, M. G. A. Paris, RAJTERI, MAURO, S. V. Polyakov, M. Gramegna, E. Taralli, DEGIOVANNI, IVO PIETRO, E. A. Goldschmidt, BRIDA, GIORGIO, Maria G. Mingolla, G. Brida, S. Peters, S. Kuck, M. Rajteri, L. Lolli, F. Piacentini   +23 more
core   +1 more source

Glissile Interphase Boundaries Enable Collective Phase Switching in Epitaxial Polar Oxides

Advanced Functional Materials, EarlyView.
A triple point is identified in the phase diagram of low‐symmetry epitaxial BiFeO3 thin film along with an extended regime of phase competition associated with a flattened energy landscape. The electromechanical response is shown to be governed by correlated interphase‐boundary motion, including scale‐free avalanche dynamics characteristic of systems ...
Mohammad Moein Seyfouri, Oliver Paull, Ralph Bulanadi, Yasuhiro Sakamoto, Shintaro Yasui, Mikayla Lord, Mahak Chhabra, David Walker, Patrycja Paruch, Shery Chang, Nagarajan Valanoor, Daniel Sando   +11 more
wiley   +1 more source

Giant Magnetic Coercivity Driven by Spin‐Bag Ferromagnetism in Epitaxial Sr3YCo4O10+δ Films with Engineered 2D Oxygen Vacancy Ordering

Advanced Functional Materials, EarlyView.
A giant magnetic coercivity and a vertical shift of hysteresis loops are demonstrated in Sr3YCo4O10+δ epitaxial films. The hard magnetic behavior originates from ferromagnetic spin bags stabilized within a long‐range ordered oxygen‐vacancy structure.
Yanbin Chen, Roger Guzman, Xiaomin Jia, Jialu Wu, Xing Xu, Li Sun, Jinbo Pan, Shixuan Du, Myung‐Hwan Whangbo, Wu Zhou, Jing Ma, Ce‐wen Nan, Chonglin Chen   +12 more
wiley   +1 more source

Comparative signal-to-noise analysis of fibre-optic based optical coherence tomography systems [PDF]

, 2005
Several optical coherence tomography ( OCT) systems are proposed using optical. fibre components and based around Fizeau sensing interferometers. The theoretical signal- to- noise ratio ( SNR) is calculated for each of the proposed configurations ...
Beddows, R., Casaubieilh, P., Tatam, Ralph P., Ford, Helen D.   +3 more
core   +1 more source

Optical Signature of Moiré Superlattices Formed by Twisted SrTiO3 Membranes

Advanced Functional Materials, EarlyView.
We discover optical signatures from bonded interfaces in twisted SrTiO3 moiré superlattices, including low‐frequency Raman vibrational modes and strong second‐harmonic generation, consistent with strong interlayer coupling inferred from cross‐sectional electron microscopy and ab initio calculations. ABSTRACT Moiré superlattices formed at the interfaces
T. A. M. Ragib Shahriar, Fumikazu Murakami, Xing He, Konnor Koons, Xinyan Li, Bumseop Kim, Shihan Qin, Varun Harbola, Jochen Mannhart, Yimo Han, Ruijuan Xu, Shengxi Huang, Andrew M. Rappe, Hanyu Zhu   +13 more
wiley   +1 more source

Quantum process identification: a method for characterizing non-markovian quantum dynamics

New Journal of Physics, 2019
Established methods for characterizing quantum information processes do not capture non-Markovian (history-dependent) behaviors that occur in real systems.
Ryan S Bennink, Pavel Lougovski
doaj   +1 more source

Learning Quantum Processes with Quantum Statistical Queries [PDF]

Quantum
In this work, we initiate the study of learning quantum processes from quantum statistical queries. We focus on two fundamental learning tasks in this new access model: shadow tomography of quantum processes and process tomography with respect to diamond
Chirag Wadhwa, Mina Doosti
doaj   +1 more source

Embedded Ferroelectric Nanoclusters Can Drive Polarization Reversal in a Non‐Ferroelectric Polar Film via the Proximity Effect

Advanced Functional Materials, EarlyView.
Ferroelectric nanoclusters create local internal fields in a normally non‐switchable polar film because of polarization mismatch at their interfaces. That field opposes polarization in the regions with larger polarization and reinforces polarization in the regions with smaller polarization.
Anna N. Morozovska, Eugene A. Eliseev, Sergei V. Kalinin, Long‐Qing Chen, Dean R. Evans, Venkatraman Gopalan   +5 more
wiley   +1 more source