Defining a general quantum state

[Charu Gupta]

Hello everyone,

Is it possible to define a general quantum state as -

\ket{\psi} = A\ket{e}+B\ket{g},

such that I do not assign any value to A and B and also define the state in a basis {\ket{e}, \ket{g}}, which is not the computational basis.

With such a state, is it possible to calculate density matrix.?

If it is not possible in QuTip, can someone please suggest an open software which can be used for such calculation? It'll be really helpful to me.

Thanks in advance!

[Simon Cross]

Hi Charu,

If you would like A and B to be symbolic variables, as, for example,
in the sympy library, then QuTiP does not currently support this.

If you would like to determine rho, the density matrix, from psi by
hand, then use rho = psi * psi.dag().

Regards,
Simon

[Gaurav Saxena]

Hi Charu,

I think 'tequila' might be useful in your case.

Best,

Gaurav

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Gaurav Saxena(Ph.D. Candidate)

Department of Physics and Astronomy

University of Calgary

(+1-403-992-2974)

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