Optical quantum memory based on electromagnetically induced transparency

Ma, Lei; Slattery, Oliver; Tang, Xiao

doi:10.1088/2040-8986/19/4/043001

Cited by 100 publications

(72 citation statements)

References 194 publications

(298 reference statements)

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“…These samples have nearly ideal properties including strong interaction with light for measurement and preparation, finely tuned internal interactions, as well as high environmental isolation and long internal state lifetimes. As such, atom ensembles are being applied to quantum logic operations [1][2][3], quantum memories [4][5][6][7][8], optical atomic clocks [9][10][11], atomic interferometers [12], and tests of fundamental physics [13][14][15]. To make the most of the advantageous properties of cold atomic ensembles it is frequently necessary to trap and position the ensemble [16].…”

Section: Introductionmentioning

confidence: 99%

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

et al. 2019

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We present an optical approach to compensating for spatially varying ac-Stark shifts that appear on atomic ensembles subject to strong optical control or trapping fields. The introduction of an additional weak light field produces an intentional perturbation between atomic states that is tuned to suppress the influence of the strong field. The compensation field suppresses sensitivity in one of the transition frequencies of the trapped atoms to both the atomic distribution and motion. We demonstrate this technique in a cold rubidium ensemble and show a reduction in inhomogeneous broadening in the trap. This two-colour approach emulates the magic trapping approach that is used in modern atomic lattice clocks but provides greater flexibility in choice of atomic species, probe transition, and trap wavelength.

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Section: Introductionmentioning

confidence: 99%

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

et al. 2019

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“…Recently, EIT has been harnessed for implementing different building blocks of a quantum network, such as all-optical switches and transistors [4–8], quantum storage devices [9–13], and conditional phase shifters [14–18]. Despite this remarkable success, utilizing EIT and related effects at the single-photon and single-atom level with highly scalable devices is a formidable challenge that prevents realization of a practical quantum network [19]. A promising solution is to extend these techniques to the microwave domain using superconducting quantum circuits that are both scalable and enable deterministic placement of long-lived artificial atoms for the network nodes [20–23].…”

mentioning

confidence: 99%

“…The fidelity of the dark state preparation is an important metric for a EIT-based quantum memory [19]. With our experimental parameters, we inferred the dark state fidelity defined as [43]…”

mentioning

confidence: 99%

Electromagnetically Induced Transparency in Circuit Quantum Electrodynamics with Nested Polariton States

Long

et al. 2018

Phys. Rev. Lett.

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Quantum networks will enable extraordinary capabilities for communicating and processing quantum information. These networks require a reliable means of storage, retrieval, and manipulation of quantum states at the network nodes. A node receives one or more coherent inputs and sends a conditional output to the next cascaded node in the network through a quantum channel. Here, we demonstrate this basic functionality by using the quantum interference mechanism of electromagnetically induced transparency in a transmon qubit coupled to a superconducting resonator. First, we apply a microwave bias, i.e., drive, to the the qubit–cavity system to prepare a Λ-type three-level system of polariton states. Second, we input two interchangeable microwave signals, i.e., a probe tone and a control tone, and observe that transmission of the probe tone is conditional upon the presence of the control tone that switches the state of the device with up to 99.73 % transmission extinction. Importantly, our EIT scheme uses all dipole allowed transitions. We infer high dark state preparation fidelities of > 99.39 % and negative group velocities of up to −0.52 ± 0.09 km/s based on our data.

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“…where the diffraction terms have been neglected in the Maxwell equations (29) and (31), like for the Λ scheme.…”

Section: The Tripod Systemmentioning

confidence: 99%

Transfer of optical vortices in coherently prepared media

et al. 2019

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We consider transfer of optical vortices between laser pulses carrying orbital angular momentum (OAM) in a cloud of cold atoms characterized by the Λ configuration of the atom-light coupling.The atoms are initially prepared in a coherent superposition of the lower levels, creating a so-called phaseonium medium. If a single vortex beam initially acts on one transition of the scheme, an extra laser beam is subsequently generated with the same vorticity as that of the incident vortex beam.The absorption of the incident probe beam takes place mostly at the beginning of the atomic medium within the absorption length. The losses disappear as the probe beam propagates deeper into the medium where the atoms are transferred to their dark states. The method is extended to a tripod atom-light coupling scheme and a more general n + 1-level scheme containing n ground states and one excited state, allowing for creating of multiple twisted light beams. We also analyze generation of composite optical vortices in the scheme using a superposition of two initial vortex beams and study lossless propagation of such composite vortices.

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Optical quantum memory based on electromagnetically induced transparency

Cited by 100 publications

References 194 publications

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

Electromagnetically Induced Transparency in Circuit Quantum Electrodynamics with Nested Polariton States

Transfer of optical vortices in coherently prepared media

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