Plasma and Quantum Group
Plasma and Quantum Group
Welcome to Prof. Yuan Shi's research group. WeÌýstudy magnetized laser-plasma interactions for fusion and photonics, developÌýquantum computing for high-energy-density systems, andÌýinvestigate plasma physics in relativistic and quantum regimes.ÌýWe welcome members from all backgrounds with an interest inÌýexploringÌýfundamental physics questions and developing concepts for future technologies.ÌýÌý
News
- The Journal of Plasma PhysicsÌýis gathering a special collection on Plasma and Quantum Information Sciences.ÌýThe submission will remain open until OctoberÌý31st, 2024.ÌýFor more information, please visit the .Ìý

Quantum walk on a lattice formed by two angular momenta
Angular momentum eigenstates can beÌýprepared efficiently usingÌýengineered quantum walk.

Laser pulse compression via upper-hybrid wave
Magnetized plasmas can be used to amplify and compress laser pulses.Ìý

Three-wave coupling coefficients in magnetized plasmas
Plasma can mediate nonlinear wave-wave interactions. The coupling predicted by theory matches simulations.ÌýÌý

Chaotic wave-wave interactions
Depending on the strengths of nonlinearities, wave-wave interactions can either be integrable or chaotic.

Performance of current quantum computing hardware
State preparation is used as a test for current quantum computing hardware. The density matrix realized on hardware is close to, but noticeably different from, that of the target state.ÌýÌý

Faraday rotation in magnetized plasma
In strongly magnetized plasmas, quantum effects modifyÌýFaraday rotation of linearly polarized lasers.Ìý

Laser pulse compression in strongly magnetized plasmas
Compared to unmagnetized plasmas, magnetization introduces additional resonances, which can be used to compress laser pulses more rapidly to higher intensity and shorter duration.Ìý

Hierarchy of plasma models
Plasma phenomena can be described by aÌýhierarchy of models, with QED models at the most foundational level.Ìý

Compiling quantum programs using customized gates
In theÌýnoisy intermediate-scale quantumÌý(NISQ) era, performance of quantum hardware is drastically improved whenÌýquantum programs are compiled using customized gates instead of standard gates.Ìý

Polarization rotation in pulsar magnetosphere
Due to strong magnetic fieldsÌýand fast rotation, polarimetry of pulsar magnetosphereÌýcarries rich information.Ìý

Lattice QED simulation of laser-plasma interactions
Lattice QED simulations can capture well-known plasma phenomena, such as wakefield acceleration, as well asÌýgenuine relativistic-quantum effects, such as electron-positron pair production.

Phase diagram of non-perturbative field theories
Non-perturbative field theories often exhibit nontrivial phase transitions. The phase diagram of strong-field QED is currently unknown.

Constraining parameters in three-wave models
Parameters in reduced three-wave models are constrained by first-principles simulations, which agree with theory predictions.Ìý

Effective Lagrangian of a field theory
When fluctuations occur on aÌýdynamical background rather than vacuum, additional terms arise in effective field theories.Ìý
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Regimes of plasma physics
In traditional plasma physics, charges are treated as particles and electromagnetic fields are treated as waves. However, alternative pictures may be more appropriate where charges should be treated as waves while photons should be treated as particles. In this example, the strength of an external magnetic field is a parameter that determines the regimes.

Three-wave model
The three-wave model is a reduced model that describes nonlinear wave-wave interactions. In theÌýthree-wave model, the coupling coefficient is an essential parameter, which can be deduced from more fundamental plasma models, such as the fluid model.Ìý

Experimental setup for characterizing magnetized plasma jets
In this experimental setup, magnetized plasm jets, which are produced by a laser-driven coil and a laser heated foil, is being characterized by interferometry and protonÌýradiograph.

Shadowgraph of magnetized plasma jet
Without an axial magnetic field, plasma expands almost spherically from the laser-heated foil. However, when the magnetic field is turned on, jets formÌýalong the field direction, as revealed here byÌýthe shadowgraphs.Ìý

Shot-time photograph of the OMEGA EP chamber
Photograph of the OMEGA EP chamber, right before firing the lasers in an experimentÌýthat was set up to characterizeÌýmagnetized plasma jets.

Schematics of lattice QED plasma simulations
Lattice scalar-QED simulations can be used to modelÌýplasma dynamics. After ensuring that the initial configurations are self-consistent, field equations are solvedÌýto advance field configurations in time.ÌýÌý