123 citations · 1.1k across the 30 of their papers we have counts for
30 papers
A Landscape of Cosmological Decoherence
S. Shajidul Haque, Bret Underwood
Current observations constrain primordial perturbations to be adiabatic, approximately Gaussian, and nearly-scale invariant. However, a generic mixed state satisfying these constra…
Inflation is Not Magic
S. Shajidul Haque, Ghadir Jafari, Bret Underwood
Cosmological perturbations generated during inflation exhibit striking quantum features, including entanglement and high circuit complexity. Yet their observational signatures rema…
Toward an Effective Theory of the Volume Modulus
Naman Agarwal, Andrew R. Frey, Bret Underwood
We investigate the 4-dimensional effective theory of the warped volume modulus in the presence of stabilizing effects from gaugino condensation by analyzing the linearized 10-dimen…
Universal Early-Time Growth in Quantum Circuit Complexity
S. Shajidul Haque, Ghadir Jafari, Bret Underwood
We show that quantum circuit complexity for the unitary time evolution operator of any time-independent Hamiltonian is bounded by linear growth at early times, independent of any c…
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…