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Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
Arian Vezvaee, Gargee Sharma, Sophia E. Economou +1
The interplay of optical driving and hyperfine interaction between an electron confined in a quantum dot and its surrounding nuclear spin environment produces a range of interestin…
Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
John S. Van Dyke, Yadav P. Kandel, Haifeng Qiao +3
Recent work has demonstrated a new route to discrete time crystal physics in quantum spin chains by periodically driving nearest-neighbor exchange interactions in gate-defined quan…
A solvable quantum model of dynamic nuclear polarization in quantum dots
Thomas Nutz, Edwin Barnes, Sophia E. Economou
We present a quantum mechanical theory of optically induced dynamic nuclear polarization applicable to quantum dots and other interacting spin systems. The exact steady state of th…
Enhancement of nuclear spin coherence times by driving dynamic nuclear polarization at defect centers in solids
Gargee Sharma, Torsten Gaebel, Ewa Rej +3
The hyperpolarization of nuclear spins can enable powerful imaging and sensing techniques provided the hyperpolarization is sufficiently long-lived. Recent experiments on nanodiamo…
Topological insulator ring with magnetic impurities
Arian Vezvaee, Antonio Russo, Sophia E. Economou +1
Topological insulators exhibit gapless edge or surface states that are topologically protected by time-reversal symmetry. However, several promising candidates for topologically in…
Photonic graph state generation from quantum dots and color centers for quantum communications
Antonio Russo, Edwin Barnes, Sophia E. Economou
Highly entangled graph states of photons have applications in universal quantum computing and in quantum communications. In the latter context, they have been proposed as the key i…
Deterministic generation of large-scale entangled photonic cluster state from interacting solid state emitters
Mercedes Gimeno-Segovia, Terry Rudolph, Sophia E. Economou
The ability to create large highly entangled `cluster' states is crucial for measurement-based quantum computing. We show that deterministic multi-photon entanglement can be create…
Dynamic Nuclear Polarization from Topological Insulator Helical Edge States
Antonio Russo, Edwin Barnes, Sophia E. Economou
Topological insulators are promising for spintronics and related technologies due to their spin-momentum-locked edge states, which are protected by time-reversal symmetry. In addit…
Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides
Gargee Sharma, Sophia E. Economou, Edwin Barnes
The interplay of Ising spin-orbit coupling and non-trivial band topology in transition metal dichalcogenides (TMDs) produces anomalous transport and optical properties that are ver…
Robustness of error-suppressing entangling gates in cavity-coupled transmon qubits
Xiu-Hao Deng, Edwin Barnes, Sophia E. Economou
Superconducting transmon qubits comprise one of the most promising platforms for quantum information processing due to their long coherence times and to their scalability into larg…
Fast microwave-driven three-qubit gates for cavity-coupled superconducting qubits
Edwin Barnes, Christian Arenz, Alexander Pitchford +1
Although single and two-qubit gates are sufficient for universal quantum computation, single-shot three-qubit gates greatly simplify quantum error correction schemes and algorithms…
Deterministic generation of all-photonic quantum repeaters from solid-state emitters
Donovan Buterakos, Edwin Barnes, Sophia E. Economou
Quantum repeaters are nodes in a quantum communication network that allow reliable transmission of entanglement over large distances. It was recently shown that highly entangled ph…
Spin-photon entanglement interfaces in silicon carbide defect centers
Sophia E. Economou, Pratibha Dev
Optically active spins in solid-state systems can be engineered to emit photons that are entangled with the spin in the solid. This allows for applications such as quantum communic…
Silicon vacancy center in 4H-SiC: Electronic structure and spin-photon interfaces
Ö. O. Soykal, Pratibha Dev, Sophia E. Economou
Defects in silicon carbide are of intense and increasing interest for quantum-based applications due to this material's properties and technological maturity. We calculate the mult…
Spin Coherence and Echo Modulation of the Silicon Vacancy in 4H-SiC at Room Temperature
S. G. Carter, Ö. O. Soykal, Pratibha Dev +2
The silicon vacancy in silicon carbide is a strong emergent candidate for applications in quantum information processing and sensing. We perform room temperature optically-detected…
Analytical approach to swift nonleaky entangling gates in superconducting qubits
Sophia E. Economou, Edwin Barnes
We develop schemes for designing pulses that implement fast and precise entangling quantum gates in superconducting qubit systems despite the presence of nearby harmful transitions…
Theory of dynamic nuclear polarization and feedback in quantum dots
Sophia E. Economou, Edwin Barnes
An electron confined in a quantum dot interacts with its local nuclear spin environment through the hyperfine contact interaction. This interaction combined with external control a…
Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in an InAs Quantum Dot
Samuel G. Carter, Sophia E. Economou, Alex Greilich +4
Compared to electrons, holes in InAs quantum dots have a significantly weaker hyperfine interaction that leads to less dephasing from nuclear spins. Thus many recent studies have s…
Two-qubit quantum gates for defect qubits in diamond and similar systems
Dmitry Solenov, Sophia E. Economou, Thomas L. Reinecke
We propose a fast, scalable all-optical design for arbitrary two-qubit operations for defect qubits in diamond (NV centers) and in silicon carbide, which are promising candidates f…
Scalable qubit architecture based on holes in quantum dot molecules
Sophia E. Economou, Juan I. Climente, Antonio Badolato +3
Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently controlled by optical pulses. There are, however, many challenges to deve…
High fidelity quantum gates via analytically solvable pulses
Sophia E. Economou
It is shown that a family of analytically solvable pulses can be used to obtain high fidelity quantum phase gates with surprising robustness against imperfections in the system or…
Fast Two-Qubit Gates in Semiconductor Quantum Dots using a Photonic Microcavity
Dmitry Solenov, Sophia E. Economou, T. L. Reinecke
Implementations for quantum computing require fast single- and multi-qubit quantum gate operations. In the case of optically controlled quantum dot qubits theoretical designs for l…
Electron-nuclear dynamics in a quantum dot under non-unitary electron control
Edwin Barnes, Sophia E. Economou
We introduce a method for solving the problem of an externally controlled electron spin in a quantum dot interacting with host nuclei via the hyperfine interaction. Our method acco…
Optical control of coherent interactions between quantum dot electron spins
S. Spatzek, A. Greilich, Sophia E. Economou +7
Coherent interactions between spins in quantum dots are a key requirement for quantum gates. We have performed pump-probe experiments in which pulsed lasers emitting at different p…