A mirrorless spinwave resonator

Pinel, Olivier; Everett, Jesse L.; Hosseini, Mahdi; Campbell, Geoff; Buchler, Ben C.; Lam, Ping Koy

doi:10.1038/srep17633

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…In comparison, the proposed pulsed-EIT can easily be observed on micro-second timescales so that light pulses can be generated simply using acousto-optic modulators. This in fact bears similarity with the experiment done in a Rubidium cell in [25], where cavity-like features were observed using multiple interference on long-lived spin waves in a Gradient Echo Memory [26]. Operating on microseconds time scale may have important practical consequences.…”

Section: Experimental Implementationsupporting

confidence: 81%

Coherent population trapping with a controlled dissipation: applications in optical metrology

et al. 2018

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We analyze the properties of a pulsed coherent population trapping protocol that uses a controlled decay from the excited state in a Λ-level scheme. We study this problem analytically and numerically and find regimes where narrow transmission, absorption, or fluorescence spectral lines occur. We then look for optimal frequency measurements using these spectral features by computing the Allan deviation in the presence of ground state decoherence and show that the protocol is on a par with Ramsey-CPT. We discuss possible implementations with ensembles of alkali atoms and single ions and demonstrate that typical pulsed-CPT experiments that are realized on femto-second timescales can be implemented on micro-seconds timescales using this scheme.Since its observation [1], coherent-population-trapping (CPT) and its counterpart electromagneticallyinduced-transparency (EIT) [2] have enabled a wide range of experimental achievements. Using a three-level Λ-scheme and exploiting a quantum interference effect in the excited state, coherent transfer of population (STIRAP) between vibrational states [3], efficient cooling of atoms [4], precise atomic clocks [5,6], or light storage [7,8] have been realized. Ramsey-CPT schemes have also been shown to improve the sensitivity of frequency measurements by removing power broadening issues [6]. Further, pulsed-CPT schemes have been investigated theoretically [9][10][11][12][13][14] and experimentally using femto-second lasers [15][16][17] with implications for multimode quantum memories [18].Recently, a novel pulsed-CPT scheme was realized by engineering a Λ-system in the microwave domain and exploiting the hyperfine interaction between the electron spin of a nitrogen-vacancy (NV) defect in diamond and a nearby 13 C nuclear spin [19]. The originality of the experiment is that relaxation was externally controlled through optical pumping by a far detuned laser that couples the excited state to the ground state in the Λ-system via a metastable state. By externally controlled dissipation, we mean that the decay from the excited state to the two ground states in the Λ scheme can be triggered at will. In general such a scheme with controlled relaxation is useful for atomic systems where the excited state population lifetime is too long compared to the decoherence mechanisms. Further, compared to schemes where spontaneous emission takes place during the excitation, this method can be used to measure the excited state population while the dark state is being prepared.In this work, we analyze such a pulsed-CPT scheme with a controlled decay from the excited state, both analytically and numerically. We show that interleaving sequences of unitary and fully dissipative steps gives rise to narrow dark transmission and photoluminescence spectral lines whose widths do not depend upon the spontaneous emission rate but solely upon the control pulse area and number of steps. Then, we discuss implications of this scheme for metrology and estimate its precision compared to Ramsey-CPT. Finally, we present...

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Section: Experimental Implementationsupporting

confidence: 81%

Coherent population trapping with a controlled dissipation: applications in optical metrology

et al. 2018

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“…The control power was chosen weak enough to read out only about 60% of the remaining atomic spin-wave with each recall pulse. This beam-splitting operation enables interference between the memory read-out and another input [34,35]. This scheme of repeated weak recalls has also been shown to enable a doubly-exponential enhancement on the scaling of continuous-variable entanglement distillation [36].…”

Section: Beam-splitting Resultsmentioning

confidence: 98%

High-performance Raman memory with spatio-temporal reversal

et al. 2018

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A number of techniques exist to use an ensemble of atoms as a quantum memory for light. Many of these propose to use backward retrieval as a way to improve the storage and recall efficiency. We report on a demonstration of an off-resonant Raman memory that uses backward retrieval to achieve an efficiency of 65 ± 6% at a storage time of one pulse duration. The memory has a characteristic decay time of 60 μs, corresponding to a delay-bandwidth product of 160.

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“…In the time domain this was extended to build the analogue of a Fabry-Perot cavity. In this system the round-trip time of the cavity was determined by the 12 µs memory time, thus giving an effective cavity round-trip path length of 3.6km [70].…”

Section: Gradient Echo Memorymentioning

confidence: 99%