Physics Expert (Condensed Matter / Quantum Information)

What you would do

• Build and optimize exact diagonalization algorithms with translation and reflection symmetries for large system sizes using QuSpin
• Manipulate block-diagonalized quantum subspaces, performing computations within constrained Hilbert spaces efficiently
• Compute and interpret state overlaps with reference states like Z2 order parameters to extract physical insights
• Evaluate computational and theoretical approaches submitted for research benchmarks assessing correctness
• Write detailed technical assessments explaining numerical results and physical implications

Who they want

• PhD in condensed matter physics, quantum information, or closely related field (or equivalent hands-on research experience)
• Proven expertise implementing exact diagonalization with practical experience in QuSpin and symmetry-adapted algorithms
• Demonstrated facility with block-diagonalization methods and Hilbert space partitioning for realistic system sizes
• Strong grasp of quantum many-body scars, Rydberg blockade, constrained dynamics, and interpreting results
• Experience in research evaluation, benchmark auditing, or peer review identifying conceptual and technical errors

Main skills

What the interview asks about

1. 1.Symmetry-preserving algorithm design

   Exploiting symmetries correctly determines whether code scales to large systems and how to interpret results - subtle errors produce plausible-looking wrong answers.

   For example: “Design exact diagonalization for PXP Hamiltonian on 26-site chain using translation symmetry and sector blocking. How would you verify implementation correctness and assess speedup?”

2. 2.Physical interpretation of overlaps

   Overlap values are numbers - extracting what they tell about quantum states requires translating numerical results to physical order parameters.

   For example: “A scar eigenstate shows 0.8 overlap with Z2 state at k=0 while thermal states average 0.1. What does this reveal about scar physics? What additional diagnostics would you run?”

3. 3.Error checking in computations

   Bugs in tight-binding models, boundary conditions, or symmetry implementation are subtle - they produce plausible results that are actually wrong.

   For example: “A paper claims scars in open boundary PXP. Describe your systematic approach verifying results: what checks and diagnostics would you compare?”

4. 4.Optimizing large-system calculations

   Scaling from L=20 to L=26 requires careful optimization knowing which symmetries matter most and how to structure code.

   For example: “Explain expected bottlenecks scaling QuSpin diagonalization from L=20 to L=26 for periodic PXP. How would you profile and optimize?”

5. 5.Evaluating AI-generated physics

   AI might produce correct code with flawed physical reasoning about what the code means - catching these gaps is essential.

   For example: “An AI generates exact diagonalization code claiming to identify a new many-body scar type. How would you evaluate evidence rigorously? What supplementary analysis would you request?”

A task you may get

Implement or review exact diagonalization for constrained quantum system with L >= 18 using symmetries; compute state overlaps with reference state; write report explaining spectrum, observed scars, and numerical methods used.

How to prepare

• Study QuSpin documentation and complete at least one full example with symmetry-adapted diagonalization.
• Work through numerical or computational methods from a recent condensed matter paper in detail.
• Practice writing clear technical explanations of computational approaches for readers unfamiliar with your specific code.
• Refresh understanding of tensor products, basis rotations, and how symmetries reduce Hilbert space dimension.

The facts

Pay

$100–170/hr

Open to

Bangladesh, Hong Kong, India, Indonesia, Japan, Kazakhstan, Kyrgyzstan, Malaysia, Pakistan, Philippines, Singapore, Sri Lanka, Taiwan, Thailand, Uzbekistan, Vietnam, Austria, Belarus, Belgium, Denmark, France, Germany, Greece, Italy, Netherlands, Portugal, Russia, Spain, Switzerland, United Kingdom, Argentina, Brazil, Chile, Colombia, Mexico, Peru, Algeria, Bahrain, Egypt, Iraq, Jordan, Kuwait, Lebanon, Libya, Morocco, Oman, Palestine, Qatar, Saudi Arabia, Tunisia, United Arab Emirates, United States, Canada, Nigeria, Kenya, South Africa, Ghana, Ethiopia

Field

Sciences Research

Role type

Expert

Posted

8/2/2026

Places left

10

We wrote this page from the public micro1 listing. It may be out of date, so read the full posting before you apply.