170 citations · 1.2k across the 33 of their papers we have counts for
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Complexity for Open Quantum System
Arpan Bhattacharyya, Tanvir Hanif, S. Shajidul Haque +1
We study the complexity for an open quantum system. Our system is a harmonic oscillator coupled to a one-dimensional massless scalar field, which acts as the bath. Specifically, we…
Operator Complexity for Quantum Scalar Fields and Cosmological Perturbations
S. Shajidul Haque, Chandan Jana, Bret Underwood
We calculate the operator complexity for the displacement, squeeze and rotation operators of a quantum harmonic oscillator. The complexity of the time-dependent displacement operat…
Saturation of Thermal Complexity of Purification
S. Shajidul Haque, Chandan Jana, Bret Underwood
We purify the thermal density matrix of a free harmonic oscillator as a two-mode squeezed state, characterized by a squeezing parameter and squeezing angle. While the squeezing par…