A5000886957- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Quantum Mechanics and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Topological Materials and Phenomena
- Quantum many-body systems
- Neuroscience and Music Perception
- Quantum Computing Algorithms and Architecture
- Remote Sensing in Agriculture
- Advanced Thermodynamics and Statistical Mechanics
- Species Distribution and Climate Change
- Mine drainage and remediation techniques
- Hearing Loss and Rehabilitation
- Mining and Resource Management
- Oil and Gas Production Techniques
- Tree-ring climate responses
- Groundwater and Watershed Analysis
- Semiconductor materials and devices
- Plant Water Relations and Carbon Dynamics
- Gyrotron and Vacuum Electronics Research
- Water Systems and Optimization
- Image and Signal Denoising Methods
- Acoustic Wave Resonator Technologies
- Arsenic contamination and mitigation
University of Cambridge
2017-2024
Cavendish Hospital
2023
University of Toronto
2016-2018
We show that postselection offers a nonclassical advantage in metrology. In every parameter-estimation experiment, the final measurement or postprocessing incurs some cost. Postselection can improve rate of Fisher information (the average learned about an unknown parameter from experimental trial) to This improvement, we show, stems negativity quasiprobability distribution, quantum extension probability distribution. classical theory, which all observables commute, our distribution be...
Abstract Surface acoustic waves (SAWs) strongly modulate the shallow electric potential in piezoelectric materials. In semiconductor heterostructures such as GaAs/AlGaAs, SAWs can thus be employed to transfer individual electrons between distant quantum dots. This mechanism makes SAW technologies a promising candidate convey information through circuit of logic gates. Here we present two essential building blocks SAW-driven circuit. First, implement directional coupler allowing partition...
In a recent paper [Das, Modak, and Bera, Phys. Rev. A 107, 042413 (2023)], Das et al. claim that Kirkwood-Dirac negativity is not required to achieve anomalous values of the quantum Fisher information encoded in postselected (filtered) particles. We argue this wrong. Further, we show optimal metrology directly proportional total nonclassicality.
The expansion of copper mining on the hyper-arid pacific slope southern Peru has precipitated growing concern for scarce water resources in region. Located headwaters Torata river, department Moquegua, Cuajone mine, owned by Southern Copper, provides a unique opportunity, little-studied region, to examine relative impact landscape-scale Principal component analysis and cluster chemistry data from 16 sites, collected over three seasons during 2017 2018, show distinct statistical groupings...
The expansion of copper mining on the hyper-arid pacific slope Southern Peru has precipitated growing concern for scarce water resources in region. Located headwaters Torata river, department Moquegua, Cuajone mine, owned by Copper, provides a unique opportunity little-studied region to examine relative impact landscape-scale Principal component and cluster analyses chemistry data from 16 sites, collected over three seasons during 2017 2018, show distinct statistical groupings indicating...
Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials. Here we show how electron-spin qubits located on dynamic be entangled. Previous theoretical and numerical models of quantum-dot entanglement generation have been insufficient to study dynamics realistic experimental devices. We utilize state-of-the-art graphics processing units simulate the wave function two electrons carried by a SAW through 2D semiconductor heterostructure. build methodology implement...
In this paper we present a protocol for the implementation of positive-operator-valued measure (POVM) on massive fermionic qubits. We methods implementing nondispersive qubit transport, spin rotations, and polarizing beam-splitter operations. Our scheme attains linear opticslike control spatial extent qubits by considering ground-state electrons trapped in minima surface acoustic waves semiconductor heterostructures. Furthermore, numerically simulate high-fidelity POVM that carries out...
Accurate detection and quantification of regional vegetation trends is essential for understanding the dynamics landscape ecology distribution. We applied a comprehensive trend analysis to satellite data describe geo-spatial changes in along Pacific slope Peru northern Chile, from sea level continental divide, region characterised by biologically unique highly sensitive arid semi-arid environments. Our statistical analyses show broad patterns positive EVI, called...
We present a numerically-optimized multipulse framework for the quantum control of single-electron double dot qubit. Our defines set pulse sequences, necessary manipulation ideal qubit basis, that avoids errors associated with excitations outside computational subspace. A novel scheme manipulates adiabatically, while also retaining high speed and ability to perform general single-qubit rotation. This basis generates spatially localized logical states, making readout straightforward. consider...
Accurate detection and quantification of regional vegetation trends are essential for understanding the dynamics landscape ecology distribution. We applied a comprehensive trend analysis to satellite data describe geospatial changes in along Pacific slope Peru northern Chile, from sea level continental divide, region characterised by biologically unique highly sensitive arid semi-arid environments. Our statistical analyses show broad patterns positive EVI, called “greening”, alongside...
We present a quantum algorithm for portfolio optimisation. Specifically, an end-to-end approximate optimisation (QAOA) to solve the discrete global minimum variance (DGMVP) model. This model finds of risky assets with lowest possible risk contingent on number traded being discrete. provide complete pipeline this and analyses its viability noisy intermediate-scale computers. design initial states, cost operator, ans\"atze hard mixing operators within binary encoding. Further, we perform...
Gap detection is an important measure of the temporal resolution auditory system. We present a model gap involving statistics peripheral neural activity: detecting involves interval that different from usual interspike found in spike train. The capable resolving number observations empirical research including why across-channel (or across-frequency) order magnitude larger than performed channel (i.e., using same frequency). achieve this by recognizing in-channel strategy detection. also...
The interaction of molten smelt and water inside a recovery boiler dissolving tank produces loud noise can be violent even during normal operation. Inadequate shattering the stream leads to more interaction, as evidenced by an increased acoustic intensity tank. On rare occasions, explode, causing equipment damage injury personnel. To warn operators changes in conditions, acoustics-based monitoring system could developed. assess feasibility such system, observations were recorded at three...
We present a numerically-optimized multipulse framework for the quantum control of single-electron charge qubit. Our defines set pulse sequences, necessary manipulation ideal qubit basis, that avoids errors associated with excitations outside computational subspace. A novel scheme manipulates adiabatically, while also retaining high speed and ability to perform general single-qubit rotation. This basis generates spatially localized logical states, making readout straightforward. consider...
We study how to use the surface states in a Bi$_{2}$Se$_{3}$ topological insulator ultra-thin film that are affected by finite size effects for purpose of quantum computing. demonstrate that: (i) under effect can effectively form two-level system where their energy levels lie between bulk gap and logic qubit be constructed, (ii) initialized manipulated using electric pulses simple forms, (iii) two-qubit entanglement is achieved through $\sqrt{\text{SWAP}}$ operation when two qubits parallel...