354 citations · 664 across the 23 of their papers we have counts for
23 papers
An LLM-Orchestrated Agent for Directional-Coupler Design with Self-Consistent Eigenmode and FDTD Validation
Saumya Biswas, Amrit De, Md Tauhidul Islam
We present a design agent which is a Large Language Model (LLM) that orchestrates, but does not perform, the numerical simulations to design a silicon-on-insulator (SOI) …
Topological argument for robustness of coherent states in quantum optics
Saumya Biswas, Amrit De, Avik Dutt
Coherent states, being the closest analog to classical states of wave systems, are well known to possess special properties that set them apart from most other quantum optical stat…
Anomalous Magneto Optic Effects from an Antiferromagnet Topological-Insulator Heterostructure
Amrit De, Tonmoy K. Bhowmick, Roger Lake
Materials with no net magnetization are generally not magneto-optically active. While this is individually true for a collinear antiferromagnet (AFM) and a topological insulator (T…
High Figure of Merit Magneto Optics from Interfacial Skyrmions on Topological Insulators
Tonmoy K. Bhowmick, Amrit De, Roger K. Lake
In the Kerr rotation geometry, magneto optic memory devices typically suffer from low figure-of-merit (FOM) and long write times. We show that skyrmions formed at the interface of…
1/f Flux Noise in low-T SQUIDs due to Superparamagnetic Phase Transitions in Defect Clusters
Amrit De
It is shown here that flux noise in conventional low-T SQUIDs is a result of low temperature superparamagnetic phase transitions in small clusters of strongly correlate…
Interlayer Transport through a Graphene / Rotated-Boron-Nitride / Graphene Heterostructure
Supeng Ge, K. M. Masum Habib, Amrit De +4
Interlayer electron transport through a graphene / hexagonal boron-nitride (h-BN) / graphene heterostructure is strongly affected by the misorientation angle of the h-BN with r…
Interlayer Resistance of Misoriented MoS2
Kuan Zhou, Darshana Wickramaratne, Supeng Ge +3
Interlayer misorientation in transition metal dichalcogenides alters the interlayer distance, the electronic band structure, and the vibrational modes, but, its effect on the inter…
Strong Cavity-Pseudospin Coupling in Monolayer Transition Metal Dichalcogenides: Spontaneous Spin-Oscillations and Magnetometry
Amrit De, Roger Lake
Strong coupling between the electronic states of monolayer transition metal dichalcogenides (TMDC) such as MoS, MoSe, WS, or WSe, and a two-dimensional (2D) photoni…
Fast Quantum Control for Weakly Nonlinear Qubits: On Two-Quadrature Adiabatic Gates
Amrit De
Adiabatic or slowly varying gate operations are typically required in order to remain within the qubit subspace in an anharmonic oscillator. However significant speed ups are possi…
Universal set of Dynamically Protected Gates for Bipartite Qubit Networks II: Soft Pulse Implementation of the [[5,1,3]] Quantum Error Correcting Code
Amrit De, Leonid P. Pryadko
We model repetitive quantum error correction (QEC) with the single-error-correcting five-qubit code on a network of individually-controlled qubits with always-on Ising couplings, u…
An Ising-Glauber Spin Cluster Model for Temperature Dependent Magnetization Noise in SQUIDs
Amrit De
Clusters of interacting two-level-systems (TLS),likely due to centers at the metal-insulator interface, are shown to self consistently lead to magnetization noise i…
Control of Majorana Edge Modes by a g-factor Engineered Nanowire Spin Transistor
Amrit De, Alexey A. Kovalev
We propose the manipulation of Majorana edge states via hybridization and spin currents in a nanowire spin transistor. The spin transistor is based on a heterostructure nanowire co…
Dynamically corrected gates for qubits with always-on Ising couplings: Error model and fault-tolerance with the toric code
Amrit De, Leonid P. Pryadko
We describe how a universal set of dynamically-corrected quantum gates can be implemented using sequences of shaped decoupling pulses on any qubit network forming a sparse bipartit…
A Couped-Qubit Tavis Cummings Scheme for Prolonging Quantum Coherence
Amrit De
Qubit-qubit interactions can significantly boost quantum coherence times for Bell states. The coherence-time-enhancements are however not monotonic and there exists a phase where f…
Spin Transfer of Quantum Information between Majorana Modes and a Resonator
Alexey A. Kovalev, Amrit De, Kirill Shtengel
We show that resonant coupling and entanglement between a mechanical resonator and majorana bound states can be achieved via spin currents in a 1D quantum wire with strong spin-orb…
Continuous third harmonic generation in a terahertz driven modulated nanowire
Kathleen E. Hamilton, Alexey A. Kovalev, Amrit De +1
We consider the possibility of observing continuous third-harmonic generation using a strongly driven, single-band one-dimensional metal. In the absence of scattering, the quantum…
Magnetization Noise Induced Collapse and Revival of Rabi Oscillations in circuit QED
Amrit De, Robert Joynt
We use a quasi Hamiltonian formalism to describe the dissipative dynamics of a circuit QED qubit that is affected by several fluctuating two level systems with a 1/f noise power sp…
Electronic Structure and Optical Properties of the Lonsdaleite Phase of Si, Ge and diamond
Amrit De, Craig E. Pryor
Crystalline semiconductors may exist in different polytypic phases with significantly different electronic and optical properties. In this paper, we calculate the electronic struct…
Universal set of scalable dynamically corrected gates for quantum error correction with always-on qubit couplings
Amrit De, Leonid P. Pryadko
We construct a universal set of high fidelity quantum gates to be used on a sparse bipartite lattice with always-on Ising couplings. The gates are based on dynamical decoupling seq…
Optical Dielectric Functions of III-V Semiconductors in Wurtzite Phase
Amrit De, Craig E. Pryor
Optical properties of semiconductors can exhibit strong polarization dependence due to crystalline anisotropy. A number of recent experiments have shown that the photoluminescence…
Suppression of Decoherence and Disentanglement by the Exchange Interaction
Amrit De, Alex Lang, Dong Zhou +1
Entangled qubit pairs can serve as a quantum memory or as a resource for quantum communication. The utility of such pairs is measured by how long they take to disentangle or decohe…
Predicted band structures of III-V semiconductors in wurtzite phase
Amrit De, Craig E. Pryor
While non-nitride III-V semiconductors typically have a zincblende structure, they may also form wurtzite crystals under pressure or when grown as nanowhiskers. This makes electron…
Electric-field control of a hydrogenic donor's spin in a semiconductor
A. De, Craig E. Pryor, Michael E. Flatté
An AC electric field applied to a donor-bound electron in a semiconductor modulates the orbital character of its wave function, which affects the electron's spin dynamics via the s…