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6 papers · 2 filters
Local entanglement of electrons in 1D hydrogen molecule
Ivan P. Christov
The quantum entanglement entropy of the electrons in one-dimensional hydrogen molecule is quantified locally using an appropriate partitioning of the two-dimensional configuration…
Defying Conventional Wisdom in Spectroscopy: Power Narrowing on IBM Quantum
Ivo S. Mihov, Nikolay V. Vitanov
Power broadening the broadening of the spectral line profile of a two-state quantum transition as the amplitude of the driving field increases is a well-known and thoroughl…
Ultrahigh-fidelity composite quantum phase gates
Hayk L. Gevorgyan, Nikolay V. Vitanov
A number of composite pulse (CP) sequences for four basic quantum phase gates -- the Z, S, T and general phase gates -- are presented. The CP sequences contain up to 18 pulses and…
Laser-free method for creation of two-mode squeezed state and beam-splitter transformation with trapped ions
Bogomila S. Nikolova, Peter A. Ivanov
We propose a laser-free method for creation of a phonon two-mode squeezed state and a beam-splitter transformation, using time-varying electric fields and non-linear couplings betw…
Quantum metrology with critical driven-dissipative collective spin system
Venelin P. Pavlov, Diego Porras, Peter A. Ivanov
We propose a critical dissipaive quantum metrology schemes for single parameter estimation which are based on a quantum probe consisting of coherently driven ensemble of spin-1…
Pulse shape effects in qubit dynamics demonstrated on an IBM quantum computer
Ivo S. Mihov, Nikolay V. Vitanov
We present a study of the coherent interaction of a qubit with a pulse-shaped external field of a constant carrier frequency. We explore, theoretically and experimentally, the tran…