Logic operations in a doped solid driven by stimulated Raman adiabatic passage

Abstract

We experimentally demonstrate classical-optical logic operations in a solid-state memory, coherently driven by variants of stimulated Raman adiabatic passage (STIRAP). Cyclic transfer of atomic populations permits the implementation of a flip-flop or XOR gate, with up to eight optical input operations. Observation of stimulated emission as an additional output channel enables the setup of a STIRAP-driven full adder for three optical input bits (or two input bits and a memory bit).

Implementation of all-optical Toffoli gate in Λ-systems

“…The scheme we propose does not require improving of this experiment and demonstrates only that in similar way a reversible universal processor can be designed. It should be noted that all-optical coherent logic elements, like those realized in the experiment [28], which employ coherent interactions of resonant atoms and laser pulses, are necessary intermediate stage in passing from classical to quantum calculations. At the same time, for direct transition from quantum to classical logic schemes the latter must contain only reversible elements like the Toffoli gate.…”

Stimulated Raman adiabatic control of a nuclear spin in diamond

“…where σ z = σ 11 − σ 22 , σ x = σ 12 + σ 21 and σ y = −iσ 12 + iσ 21 . Note that the shape of the pulses Ω S and Ω p , and their relative phase can be arranged to arbitrarily move the nuclear state on the Bloch sphere.…”

“…The same process is also possible through a bright state (b-STIRAP) 14,15 and both methods have been realized in doped solids 14,[16][17][18] , cold atoms 19 , and quantum dots 20 , to name a few. It has been implemented for coherent manipulation of states 19 in logic operations 21,22 , quantumness witness detection 23 and entanglement generation 24 . In quantum metrology, it has been proposed to improve the detection of electric dipole moments using ThO molecules 25 , and for mapping light states in to nuclear spins states in optical cavities 26 .…”

Stimulated Raman adiabatic passage via bright state in Λ medium of unequal oscillator strengths

“…(13) we neglected the time dependence of the one-photon detuning ∆ p which is valid for large initial values of this parameter and at the propagation lengths satisfying the condition (15).…”

“…Recently, the combination of STIRAP and b-STIRAP have been used for the experimental implementation of optical logical gates in a solid memory [15].…”