Posts

Checking if a number contains a certain pattern.

We use the variational principle to prove that one-dimensional attractive potential of any shape supports a bound state.

We use the Born approximation to compute the differential cross section for the elastic scattering of a fast electron by a hydrogen …

Some fun with two dimensional harmonic oscillator with perturbation

A proof that square of the angular momentum vector is a Hermitian operator.

Some simple calculations on qubit decoherence due to phonons.

We show that if there is a simultaneous eigenstate of two components of the angular momentu, then this state has zero eigenvalues for …

Some fun with adding up angular momentum.

Some notes on few quantum algorithms.