233 citations · 1.7k across the 55 of their papers we have counts for
22 papers · 1 filter
Approaching near-perfect state discrimination of photonic Bell states through the use of unentangled ancilla photons
Jake A. Smith, Lev Kaplan
Despite well-established no-go theorems on a perfect linear optical Bell state analyzer, we find a numerical trend that appears to approach a near-perfect measurement if we incorpo…
Optimal entangling operations between deterministic blocks of qubits encoded into single photons
Jake A. Smith, Lev Kaplan
Here, we numerically simulate probabilistic elementary entangling operations between rail-encoded photons for the purpose of scalable universal quantum computation or communication…
Controllable quantum scars in semiconductor quantum dots
J. Keski-Rahkonen, P. J. J. Luukko, L. Kaplan +2
Quantum scars are enhancements of quantum probability density along classical periodic orbits. We study the recently discovered phenomenon of strong, perturbation-induced quantum s…
Strong quantum scarring by local impurities
Perttu J. J. Luukko, Byron Drury, Anna Klales +3
We discover and characterize strong quantum scars, or eigenstates resembling classical periodic orbits, in two-dimensional quantum wells perturbed by local impurities. These scars…
Optimal Encoding Capacity of a Linear Optical Quantum Channel
Jake A. Smith, Dmitry B. Uskov, Lev Kaplan
Here, we study the capacity of a quantum channel, assuming linear optical encoding, as a function of available photons and optical modes. First, we observe that substantial improve…
Dynamic electron correlation in interactions of light with matter formulated in b-space
Lev Kaplan, J. H. McGuire
Scattering of beams of light and matter from multi-electron atomic targets is formulated in the position representation of quantum mechanics. This yields expressions for the probab…
Atomic form factor for twisted vortex photons interacting with atoms
Pierson Guthrey, Lev Kaplan, J. H. McGuire
The relatively new atomic form factor for twisted (vortex) beams, which carry orbital angular momentum (OAM), is considered and compared to the conventional atomic form factor for…
On Exchange of Orbital Angular Momentum Between Twisted Photons and Atomic Electrons
Basil S. Davis, L. Kaplan, J. H. McGuire
We obtain an expression for the matrix element for a twisted (Laguerre-Gaussian profile) photon scattering from a hydrogen atom. We consider photons incoming with an orbital angula…
Proposed Experiment in Two-Qubit Linear Optical Photonic Gates for Maximal Success Rates
A. Matthew Smith, D. B. Uskov, M. Fanto +2
Here we propose an experiment in Linear Optical Quantum Computing (LOQC) using the framework first developed by Knill, Laflamme, and Milburn. This experiment will test the ideas of…
Imperfect Linear Optical Photonic Gates with Number-Resolving Photodetection
A. Matthew Smith, D. B. Uskov, L. H. Ying +1
We use the numerical optimization techniques of Uskov et al. [PRA 81, 012303 (2010)] to investigate the behavior of the success rates for KLM style [Nature 409, 46 (2001)] two- and…
Quantum Vacuum Energy in Graphs and Billiards
L. Kaplan
The vacuum (Casimir) energy in quantum field theory is a problem relevant both to new nanotechnology devices and to dark energy in cosmology. The crucial question is the dependence…
Generic Two-Qubit Photonic Gates Implemented by Number-Resolving Photodetection
Dmitry B. Uskov, A. Matthew Smith, Lev Kaplan
We combine numerical optimization techniques [Uskov et al., Phys. Rev. A 79, 042326 (2009)] with symmetries of the Weyl chamber to obtain optimal implementations of generic linear-…
Optimization of quantum interferometric metrological sensors in the presence of photon loss
Tae-Woo Lee, Sean D. Huver, Hwang Lee +7
We optimize two-mode, entangled, number states of light in the presence of loss in order to maximize the extraction of the available phase information in an interferometer. Our app…
Maximal Success Probabilities of Linear-Optical Quantum Gates
Dmitry B. Uskov, Lev Kaplan, A. Matthew Smith +2
Numerical optimization is used to design linear-optical devices that implement a desired quantum gate with perfect fidelity, while maximizing the success rate. For the 2-qubit CS (…
Inflationary dynamics for matrix eigenvalue problems
Eric J. Heller, Lev Kaplan, Frank Pollmann
Many fields of science and engineering require finding eigenvalues and eigenvectors of large matrices. The solutions can represent oscillatory modes of a bridge, a violin, the disp…
A trivial observation on time reversal in random matrix theory
L. Kaplan, F. Leyvraz, C. Pineda +1
It is commonly thought that a state-dependent quantity, after being averaged over a classical ensemble of random Hamiltonians, will always become independent of the state. We point…
Vacuum Energy and Repulsive Casimir Forces in Quantum Star Graphs
S. A. Fulling, L. Kaplan, J. H. Wilson
Casimir pistons are models in which finite Casimir forces can be calculated without any suspect renormalizations. It has been suggested that such forces are always attractive, but…
Repulsive Casimir Pistons
S. A. Fulling, J. H. Wilson
Casimir pistons are models in which finite Casimir forces can be calculated without any suspect renormalizations. It has been suggested that such forces are always attractive. We p…
An overview of simply pulsed qubits
A. Chalastaras, L. Kaplan, Kh. Kh. Shakov +2
The behavior of simply pulsed qubits (quantum systems with two linearly independent states) may be characterized by the energy difference between the two states of the qubit a…
Sudden switching in qubits
Kh. Kh. Shakov, J. H. McGuire, L. Kaplan +2
Analytic solutions are developed for two-state systems (e.g. qubits) strongly perturbed by a series of rapidly changing pulses, called `kicks'. The evolution matrix may be expresse…
Time Ordering in Kicked Qubits
L. Kaplan, Kh. Kh. Shakov, A. Chalastaras +3
We examine time ordering effects in strongly, suddenly perturbed two-state quantum systems (kicked qubits) by comparing results with time ordering to results without time ordering.…
Quantization Ambiguity, Ergodicity, and Semiclassics
L. Kaplan
A simple argument shows that eigenstates of a classically ergodic system are individually ergodic on coarse-grained scales. This has implications for the quantization ambiguity in…