Enhanced absorption of weak ultrashort light pulses by a narrowband atomic medium

Optimization of Broadband Λ-type Quantum Memory Using Gaussian Pulses

“…The optimized control fields arrive at the approximate time when the electric field of the signal changes sign, in agreement with the analysis of Refs. [35,38,39]. Importantly, the optimized control field is also significantly narrower in duration than the signal field, which again maximizes the duration of the absorption process before transfer.…”

“…For this restricted optimization scheme we find that two physical mechanisms lead to a maximum memory efficiency at finite bandwidth. In the non-adiabatic (dτ FWHM γ 1) and broadband (τ FWHM 1/γ) regime, we find that the optimized protocol corresponds to storage via ATS [30], where the finite linewidth of the excited state limits the absorption of the signal field (i.e., population of the P field), and therefore how much population can be transferred to the storage field, B [35]. This is in contrast to the adiabatic (dτ FWHM γ 1) and narrowband (τ FWHM > 1/γ) regime, where the optimized protocol corresponds to storage via EIT and the storage efficiency at finite optical depth is limited by imperfect adiabatic elimination of the P field, which leads to loss and decay back to ground state |1 [29,31,36].…”

Variance-based sensitivity analysis of Λ -type quantum memory

“…II to the case of resonant, Λ-type quantum memory, beginning with the effect of fluctuating memory parameters on memory efficiency. In the resonant case, there exist three well-known quantum memory protocols: the electromagnetically induced transparency (EIT) [21,[50][51][52], Autler-Townes Splitting (ATS) [22,[53][54][55], and absorb-thentransfer (ATT) [23,24,35,52,56] protocols. A summary of these protocols is given in Ref.…”

Variance-Based Sensitivity Analysis of Λ-type Quantum Memory

“…II to the case of resonant, Λ-type quantum memory, beginning with the effect of fluctuating memory parameters on memory efficiency. In the resonant case, there exist three well-known quantum memory protocols: the electromagnetically induced transparency (EIT) [21,[50][51][52], Autler-Townes Splitting (ATS) [22,[53][54][55], and absorbthen-transfer (ATT) [23,24,35,52,56] protocols.…”