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Near Field Communication

Prof. Abhinav V. Deshpande
2016 Zenodo  
Near Filed Communication (NFC) is a close range radio communication protocol which is used for very sensitive applications. It was jointly developed by Sony and Philips. The standard specifies the ways to establish P2P (Peer - to - Peer) communication links for data exchange. After the P2P network has been configured,another wireless communication technology,such as Bluetooth Wi - Fi,can be used for longer range communication or for transferring larger amounts of data. Its development was
more » ... el to RFID (Radio Frequency Identification),but both differ in many ways. NFC offers a very short range as compared to RFID. This is an added advantage in the sense that it requires a very little transmission power and cheap tran smitters can be used for the purpose . Hence it is very suitable for Smartcard like applications. It can also work in both active and passive modes. NFC works on a frequency range of 13.56 MHz It offers a baud rate of 106 kbps to 424 kbps. The transmission is made from a frequency of 13.56 MHz inductively;hence it uses a high magnetic field. At a transmission only the two participants can be involved - one transmitter (initiator) and one receiver (target). The transmission can be either in active fashion or p assive fashion. Both have their own merits and demerits. The NFC transmission runs helping duplex,i.e. that one of the two devices can send only in each case or receive at a time . https://www.ijiert.org/paper-details?paper_id=140742
doi:10.5281/zenodo.1464712 fatcat:cota2474gnbjnnbhtkattepkvq

Quantum-inspired permanent identities [article]

Ulysse Chabaud, Abhinav Deshpande, Saeed Mehraban
2022 arXiv   pre-print
The permanent is pivotal to both complexity theory and combinatorics. In quantum computing, the permanent appears in the expression of output amplitudes of linear optical computations, such as in the Boson Sampling model. Taking advantage of this connection, we give quantum-inspired proofs of many existing as well as new remarkable permanent identities. Most notably, we give a quantum-inspired proof of the MacMahon master theorem as well as proofs for new generalizations of this theorem.
more » ... s proofs of this theorem used completely different ideas. Beyond their purely combinatorial applications, our results demonstrate the classical hardness of exact and approximate sampling of linear optical quantum computations with input cat states.
arXiv:2208.00327v2 fatcat:rnazt6fdwzblvca3fi7t2lyaom

OFFSET REDUCTION IN THE DOUBLE TAILED LATCH-TYPE VOLTAGE SENSE AMPLIFIER

Abhinav V. Deshpande
2019 Zenodo  
This research paper presents an improved double tailed latch type voltage sense amplifier by using a latch load in the first stage. A latch load at the first stage provides the second stage with a large input difference voltage. Thus, completely removes the offset voltage due to the mismatch in the transistor pairs in the second stage of the Sense Amplifier. The performance of the Sense Amplifier was simulated by using the LT Spice with a threshold mismatch of 10% in between the transistor
more » ... of the second stage, where it achieved the offset removal at 3 GHz clock rate with VDD = 1. 2 Volts in a 90 nm CMOS technology. Since the input transistors of the first stage are in parallel with the transistor pair of the latch, it does not affect the delay.
doi:10.5281/zenodo.3336352 fatcat:hd4do7m6fngktftzpfzz33ghpm

Simulation Complexity of Many-Body Localized Systems [article]

Adam Ehrenberg, Abhinav Deshpande, Christopher L. Baldwin, Dmitry A. Abanin, Alexey V. Gorshkov
2022 arXiv   pre-print
We use complexity theory to rigorously investigate the difficulty of classically simulating evolution under many-body localized (MBL) Hamiltonians. Using the defining feature that MBL systems have a complete set of quasilocal integrals of motion (LIOMs), we demonstrate a transition in the classical complexity of simulating such systems as a function of evolution time. On one side, we construct a quasipolynomial-time tensor-network-inspired algorithm for strong simulation of 1D MBL systems
more » ... calculating the expectation value of arbitrary products of local observables) evolved for any time polynomial in the system size. On the other side, we prove that even weak simulation, i.e. sampling, becomes formally hard after an exponentially long evolution time, assuming widely believed conjectures in complexity theory. Finally, using the consequences of our classical simulation results, we also show that the quantum circuit complexity for MBL systems is sublinear in evolution time. This result is a counterpart to a recent proof that the complexity of random quantum circuits grows linearly in time.
arXiv:2205.12967v1 fatcat:7ebbgew6ybbezlq5ldqvnbplie

Page curves and typical entanglement in linear optics [article]

Joseph T. Iosue, Adam Ehrenberg, Dominik Hangleiter, Abhinav Deshpande, Alexey V. Gorshkov
2022 arXiv   pre-print
Bosonic Gaussian states are a special class of quantum states in an infinite dimensional Hilbert space that are relevant to universal continuous-variable quantum computation as well as to near-term quantum sampling tasks such as Gaussian Boson Sampling. In this work, we study entanglement within a set of squeezed modes that have been evolved by a random linear optical unitary. We first derive formulas that are asymptotically exact in the number of modes for the R\'enyi-2 Page curve (the average
more » ... R\'enyi-2 entropy of a subsystem of a pure bosonic Gaussian state) and the corresponding Page correction (the average information of the subsystem) in certain squeezing regimes. We then prove various results on the typicality of entanglement as measured by the R\'enyi-2 entropy by studying its variance. Using the aforementioned results for the R\'enyi-2 entropy, we upper and lower bound the von Neumann entropy Page curve and prove certain regimes of entanglement typicality as measured by the von Neumann entropy. Our main proofs make use of a symmetry property obeyed by the average and the variance of the entropy that dramatically simplifies the averaging over unitaries. In this light, we propose future research directions where this symmetry might also be exploited. We conclude by discussing potential applications of our results and their generalizations to Gaussian Boson Sampling and to illuminating the relationship between entanglement and computational complexity.
arXiv:2209.06838v1 fatcat:bb3uzony7vhunhxeyiklq7rpnu

Ball in the Wall: Mesenteric Fibromatosis—a Rare Case Report

Abhinav Deshpande, Ankita Tamhane, Y. S. Deshpande, Radhika Pagey, Meena Pangarkar
2020 Indian Journal of Surgical Oncology  
Mesenteric fibromatosis-desmoid tumor of mesentery is a rare benign soft tissue tumor of mesentery. On CT, it mimics gastrointestinal stromal tumor (GIST). A 44-year-old female with small intestinal mass, preoperatively diagnosed radiologically and pathologically as GIST. Mesenteric fibromatosis is a rare tumor often mistaken for GIST. Histopathology and immunohistochemistry is the key as management of both the tumors differs.
doi:10.1007/s13193-020-01070-1 pmid:33082700 pmcid:PMC7534782 fatcat:u46h6m6bzzbhxevohnhx3c6cwa

The importance of the spectral gap in estimating ground-state energies [article]

Abhinav Deshpande, Alexey V. Gorshkov, Bill Fefferman
2020 arXiv   pre-print
The field of quantum Hamiltonian complexity lies at the intersection of quantum many-body physics and computational complexity theory, with deep implications to both fields. The main object of study is the LocalHamiltonian problem, which is concerned with estimating the ground-state energy of a local Hamiltonian and is complete for the class QMA, a quantum generalization of the class NP. A major challenge in the field is to understand the complexity of the LocalHamiltonian problem in more
more » ... ally natural parameter regimes. One crucial parameter in understanding the ground space of any Hamiltonian in many-body physics is the spectral gap, which is the difference between the smallest two eigenvalues. Despite its importance in quantum many-body physics, the role played by the spectral gap in the complexity of the LocalHamiltonian is less well-understood. In this work, we make progress on this question by considering the precise regime, in which one estimates the ground-state energy to within inverse exponential precision. Computing ground-state energies precisely is a task that is important for quantum chemistry and quantum many-body physics. In the setting of inverse-exponential precision, there is a surprising result that the complexity of LocalHamiltonian is magnified from QMA to PSPACE, the class of problems solvable in polynomial space. We clarify the reason behind this boost in complexity. Specifically, we show that the full complexity of the high precision case only comes about when the spectral gap is exponentially small. As a consequence of the proof techniques developed to show our results, we uncover important implications for the representability and circuit complexity of ground states of local Hamiltonians, the theory of uniqueness of quantum witnesses, and techniques for the amplification of quantum witnesses in the presence of postselection.
arXiv:2007.11582v1 fatcat:2lqur4xq4zfndnyg6zeglbphka

Differential Tariffs as a Driving Force for Electrical Energy Conservation

Abhinav V. Deshpande
2019 Engineering and Scientific International Journal  
India is on the threshold of a growth trajectory. However, it is also facing a shortage of the supply, which is increasing day by day. At the present rate of growth, the energy demand is set to increase by nearly two folds by 2020. Out of many available methods, the simplest and the most effective method of minimizing this gap would be promoting the energy conservation. The utilities are trying their best on both the supply side management (SSM) and the demand side management (DSM) by
more » ... g the different types of tariffs. In this research paper, a comparative study of the High Tension (HT), Tariff structure of five Indian states is carried out. The components of the tariff structure that are compared are Billing Demand, Energy Charges, Time of Day (TOD) tariff, Power Factor Incentive/Penalty, Load Factor Incentive, Penalty for exceeding the Contract Demand (CD) and Harmonic Penalty.
doi:10.30726/esij/v6.i4.2019.64001 fatcat:ttcaqqs2jrbkvpi7joy7td44tq

Complexity of Fermionic Dissipative Interactions and Applications to Quantum Computing

Oles Shtanko, Abhinav Deshpande, Paul S. Julienne, Alexey V. Gorshkov
2021 PRX Quantum  
Interactions between particles are usually a resource for quantum computing, making quantum manybody systems intractable by any known classical algorithm. In contrast, noise is typically considered as being inimical to quantum many-body correlations, ultimately leading the system to a classically tractable state. This work shows that noise represented by two-body processes, such as pair loss, plays the same role as many-body interactions and makes otherwise classically simulable systems
more » ... l for quantum computing. We analyze such processes in detail and establish a complexity transition between simulable and nonsimulable systems as a function of a tuning parameter. We determine important classes of simulable and nonsimulable two-body dissipation. Finally, we show how using resonant dissipation in cold atoms can enhance the performance of two-qubit gates.
doi:10.1103/prxquantum.2.030350 fatcat:4p6tjgdjwnczvetw65or3bmszq

Monitoring-induced Entanglement Entropy and Sampling Complexity [article]

Mathias Van Regemortel, Oles Shtanko, Luis Pedro Garcia-Pintos, Abhinav Deshpande, Hossein Dehghani, Alexey V. Gorshkov, Mohammad Hafezi
2022 arXiv   pre-print
The dynamics of open quantum systems is generally described by a master equation, which describes the loss of information into the environment. By using a simple model of uncoupled emitters, we illustrate how the recovery of this information depends on the monitoring scheme applied to register the decay clicks. The dissipative dynamics, in this case, is described by pure-state stochastic trajectories and we examine different unravelings of the same master equation. More precisely, we
more » ... how registering the sequence of clicks from spontaneously emitted photons through a linear optical interferometer induces entanglement in the trajectory states. Since this model consists of an array of single-photon emitters, we show a direct equivalence with Fock-state boson sampling and link the hardness of sampling the outcomes of the quantum jumps with the scaling of trajectory entanglement.
arXiv:2201.12672v2 fatcat:uideunpxlrhbblptf7ozvz6ogy

Complexity of Fermionic Dissipative Interactions and Applications to Quantum Computing [article]

Oles Shtanko, Abhinav Deshpande, Paul S. Julienne, Alexey V. Gorshkov
2021 arXiv   pre-print
Interactions between particles are usually a resource for quantum computing, making quantum many-body systems intractable by any known classical algorithm. In contrast, noise is typically considered as being inimical to quantum many-body correlations, ultimately leading the system to a classically tractable state. This work shows that noise represented by two-body processes, such as pair loss, plays the same role as many-body interactions and makes otherwise classically simulable systems
more » ... al for quantum computing. We analyze such processes in detail and establish a complexity transition between simulable and nonsimulable systems as a function of a tuning parameter. We determine important classes of simulable and nonsimulable two-body dissipation. Finally, we show how using resonant dissipation in cold atoms can enhance the performance of two-qubit gates.
arXiv:2005.10840v2 fatcat:lh6yuebeabfg3d6idoiczywuxm

Implementing a Fast Unbounded Quantum Fanout Gate Using Power-Law Interactions [article]

Andrew Y. Guo, Abhinav Deshpande, Su-Kuan Chu, Zachary Eldredge, Przemyslaw Bienias, Dhruv Devulapalli, Yuan Su, Andrew M. Childs, Alexey V. Gorshkov
2020 arXiv   pre-print
The standard circuit model for quantum computation presumes the ability to directly perform gates between arbitrary pairs of qubits, which is unlikely to be practical for large-scale experiments. Power-law interactions with strength decaying as 1/r^α in the distance r provide an experimentally realizable resource for information processing, whilst still retaining long-range connectivity. We leverage the power of these interactions to implement a fast quantum fanout gate with an arbitrary number
more » ... of targets. Our implementation allows the quantum Fourier transform (QFT) and Shor's algorithm to be performed on a D-dimensional lattice in time logarithmic in the number of qubits for interactions with α< D. As a corollary, we show that power-law systems with α< D are difficult to simulate classically even for short times, under a standard assumption that factoring is classically intractable. Complementarily, we develop a new technique to give a general lower bound, linear in the size of the system, on the time required to implement the QFT and the fanout gate in systems that are constrained by a linear light cone. This allows us to prove an asymptotically tighter lower bound for long-range systems than is possible with previously available techniques.
arXiv:2007.00662v1 fatcat:r7bs2vdkczdvjlfmknrifossmm

DESIGN APPROACH FOR CONTENT-BASED IMAGE RETRIEVAL USING GABOR-ZERNIKE FEATURES 1 ABHINAV DESHPANDE &

S Tadse
unpublished
The process of extraction of different features from an image is known as Content-based Image Retrieval .Color,Texture and Shape are the major features of an image and play a vital role in the representation of an image..In this paper, a novel method is proposed to extract the region of interest(ROI) from an image,prior to extraction of salient features of an image.The image is subjected to normalization so that the noise components due to Gaussian or other types of noises which are present in
more » ... he image are eliminated and the successfull extraction of various features of an image can be accomplished. Gabor Filters are used to extract the texture feature from an image whereas Zernike Moments can be used to extract the shape feature.The combination of Gabor feature and Zernike feature can be combined to extract Gabor-Zernike Features from an image.
fatcat:r3fdauwiejebtg3jzahm5dclca

Complexity phase diagram for interacting and long-range bosonic Hamiltonians [article]

Nishad Maskara, Abhinav Deshpande, Adam Ehrenberg, Minh C. Tran, Bill Fefferman, Alexey V. Gorshkov
2020 arXiv   pre-print
We classify phases of a bosonic lattice model based on the computational complexity of classically simulating the system. We show that the system transitions from being classically simulable to classically hard to simulate as it evolves in time, extending previous results to include on-site number-conserving interactions and long-range hopping. Specifically, we construct a "complexity phase diagram" with "easy" and "hard" phases, and derive analytic bounds on the location of the phase boundary
more » ... ith respect to the evolution time and the degree of locality. We find that the location of the phase transition is intimately related to upper bounds on the spread of quantum correlations and protocols to transfer quantum information. Remarkably, although the location of the transition point is unchanged by on-site interactions, the nature of the transition point changes dramatically. Specifically, we find that there are two kinds of transitions, sharp and coarse, broadly corresponding to interacting and noninteracting bosons, respectively. Our work motivates future studies of complexity in many-body systems and its interplay with the associated physical phenomena.
arXiv:1906.04178v2 fatcat:h2zpto6kvbaobox5p3t624t7km

The Impact of Emerging 5G Technology on U.S. Weather Prediction

Sarah E. Benish, Graham H. Reid, Abhinav Deshpande, Shantam Ravan, Rachel Lamb
2020 Journal of Science Policy & Governance  
Fifth generation (5G) wireless networks promise to provide faster and more expansive data connectivity, exceeding thresholds from previous fourth generation (4G) technology. The deployment of 5G infrastructure requires allocating additional frequencies in radio bands at 24 gigahertz (GHz), potentially contaminating neighboring remote sensing bands used for weather forecasting and prediction. The current U.S. out-of-band emissions limit at 24 GHz of -20 dBW per 200 MHz is projected to degrade
more » ... eorological forecast accuracy by up to 30%, reducing the hurricane forecast lead time by 2 to 3 days, and endangering thousands of additional lives. Under the Weather Research and Forecasting Innovation Act of 2017 (Pub.L 115-25), the National Oceanic and Atmospheric Administration (NOAA) must develop more accurate and timely severe weather forecasts in order to protect life and property and reduce economic risk; however, the potential out-of-band interference from the roll out of 5G threatens this aim. Given U.S. economic reliance on accurate weather prediction (estimated to be in the trillions of dollars), we propose that Congress mandate stricter noise restrictions to adequately meet requirements of the Pub.L 115-25, while minimizing disruption to 5G deployment.
doi:10.38126/jspg170203 fatcat:pqvhiscb7ve43nzy7pbrwfziwm
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