Superior atomic coherence time controlled by crystal phase transition and optical dressing

Abstract

We compare the atomic coherence time of doped ion crystals, i.e., BiPO4: Eu3+, YPO4: Eu3+, YPO4: Pr3+, and Y2SiO5: Pr3 + crystals. Such atomic coherence time is controlled by crystal field splitting (CF-splitting) and optical (photon and phonon) dressing. Compared with the other doped ion crystals, BiPO4: Eu3+ exhibits the longest coherence time. By controlling thermal phonon, phase-transition phonon, broadband or narrowband excitation, and fluorescence (FL) or spontaneous four-wave-mixing ratio (S-FWM), a superior atomic coherence time of up to 10 ± 0.6 ms is achieved in the pure hexagonal (0.5:1) phase of BiPO4: Eu3+. Furthermore, the relationship between TAT-splitting and spectral Autler–Townes (SAT)-splitting was investigated. This superior atomic coherence time has potential applications in quantum memory devices.

Spectral non-hermitian quantization line shape controlled by phonon dressing in various phases of Eu3+:BiPO4

“…19 The boxcar time gate (time gate) was used to select different energy levels of FL and SPFWM with different lifetimes. 26 Fig. 1(e1) to (e4) depict the different line-shape-evolution ratios obtained from the (e1) 6 : 1 sample when E 2 was scanned and E 1 was fixed at the resonant wavelength, (e2) 6 : 1 sample when E 1 was scanned and E 2 was fixed at the resonant wavelength, (e3) 6 : 1 sample when E 1 was scanned while E 2 was blocked at 300 K (black curve) and at 77 K (red curve), and (e4) 0.5 : 1 sample when E 1 was scanned while E 2 was blocked at 300 K (red curve) and at 77 K (red curve).…”

Photon–Phonon Atomic Coherence Interaction of Nonlinear Signals in Various Phase Transitions Eu3+: BiPO4

“…Recently, the photon–phonon dressing coupling in Eu 3+ ions doped BiPO 4 has been studied [ 8 , 9 ], as Eu 3+ /Pr 3+ ions are very sensitive to the site symmetry and its surrounding crystal field of the host material compared to other crystal ions [ 10 , 11 , 12 ]. Therefore, it can be achievable to obtain such a potential application in BiPO 4 crystal.…”

“…The Eu 3+ :BiPO 4 is one of the most promising atomic-like mediums known for its long coherence time (ms) [ 8 ] due to photon–phonon coupling in doubly dressed states with potential applications in quantum memory [ 18 , 19 , 20 ].…”

Photon-phonon Atomic Coherence Interaction of Non-linear Signals in Various Phase Transitions Eu3+: BiPO4

“…Recently, the photon-phonon dressing coupling in Eu 3+ ions doped BiPO4 has been studied [8][9], as Eu 3+ / Pr 3+ ions are very sensitive to the site symmetry and its surrounding crystal field of the host material than other crystal ions [10][11][12]. Therefore, it can be achievable to get such kind of potential application in BiPO4 crystal.…”

“…The Eu 3+ : BiPO4 is one of the most promising atomic-like mediums known for its long coherence time (ms) [8] due to photon-phonon coupling in doubly dressed states with potential applications in quantum memory [18][19][20].…”