Transporting Long-Lived Quantum Spin Coherence in a Photonic Crystal Fiber

Xin, Mingjie; Leong, Wui Seng; Chen, Zilong; Lan, Shau-Yu

doi:10.1103/physrevlett.122.163901

Cited by 26 publications

(24 citation statements)

References 32 publications

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“…3a . In our differential light shift compensated optical lattice potential 13 , the spin coherence time of the two spin states |↑> and |↓> measured by a microwave π /2– π – π /2 spin-echo sequence exceeds tens of milliseconds. The decay of the contrast is, thus, mostly due to the amplitude noise of the optical lattice and the radial motion of atoms.…”

Section: Resultsmentioning

confidence: 79%

“…We first collect an ensemble of 85 Rb atoms by Doppler and sub-Doppler cooling 5 mm above a 4-cm-long open-end hollow-core photonic crystal fibre. The fibre is a hypocycloid-shaped photonic crystal fibre with 1/ e 2 mode field radius of 22 μm 11 – 13 . Atoms are then transported into the fibre at a velocity of 2 cm s −1 by an optical conveyer belt using a moving optical lattice formed by a pair of counterpropagating beams 13 .…”

Section: Resultsmentioning

confidence: 99%

“…The fibre is a hypocycloid-shaped photonic crystal fibre with 1/ e 2 mode field radius of 22 μm 11 – 13 . Atoms are then transported into the fibre at a velocity of 2 cm s −1 by an optical conveyer belt using a moving optical lattice formed by a pair of counterpropagating beams 13 . The optical lattice has a period of 410.5 nm, with a power of 110 mW per beam.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, tight and diffraction-free confinement of atoms in photonic structures was used for optical switching 7 , 17 . In metrology, cold atoms in hollow-core fibres have also shown potential applications in timekeeping and sensing 8 , 12 , 13 . Regardless of these achievements, quantum control and manipulation of both external and internal degrees of freedom of atoms using photonic waveguide modes have not been realised.…”

Section: Introductionmentioning

confidence: 99%

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Large array of Schrödinger cat states facilitated by an optical waveguide

et al. 2020

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Quantum engineering using photonic structures offer new capabilities for atom-photon interactions for quantum optics and atomic physics, which could eventually lead to integrated quantum devices. Despite the rapid progress in the variety of structures, coherent excitation of the motional states of atoms in a photonic waveguide using guided modes has yet to be demonstrated. Here, we use the waveguide mode of a hollow-core photonic crystal fibre to manipulate the mechanical Fock states of single atoms in a harmonic potential inside the fibre. We create a large array of Schrödinger cat states, a quintessential feature of quantum physics and a key element in quantum information processing and metrology, of approximately 15000 atoms along the fibre by entangling the electronic state with the coherent harmonic oscillator state of each individual atom. Our results provide a useful step for quantum information and simulation with a wide range of photonic waveguide systems.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large array of Schrödinger cat states facilitated by an optical waveguide

et al. 2020

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“…Remarkably, cooling and loading happen simultaneously, which solves the mode matching issue for optical dipole traps preventing the need for an intermediate step often relying on magnetic trapping. The cooling scheme looks optimal for the rapid production of ultra-cold gases in unusual geometries [25,26] and environments [27,28], and could provide a complementary alternative for all optical degenerate gases production [29,30].…”

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confidence: 99%

Loading and cooling in an optical trap via hyperfine dark states

Naik

Eneriz-imaz

Carey

et al. 2020

Phys. Rev. Research

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We present a novel optical cooling scheme that relies on hyperfine dark states to enhance loading and cooling atoms inside deep optical dipole traps. We demonstrate a seven-fold increase in the number of atoms loaded in the conservative potential with strongly shifted excited states. In addition, we use the energy selective dark-state to efficiently cool the atoms trapped inside the conservative potential rapidly and without losses. Our findings open the door to optically assisted cooling of trapped atoms and molecules which lack the closed cycling transitions normally needed to achieve low temperatures and the high initial densities required for evaporative cooling.Ultra-cold quantum gases have attracted much attention in recent decades as versatile platforms for investigating strongly correlated quantum systems [1] and as the basis for a new class of quantum technologies based on atomic interferometry [2,3]. Cooling of an atomic gas to the required temperatures requires a multi-stage process: laser cooling in a magneto-optical trap (MOT); sub-Doppler cooling; loading into a conservative magnetic or optical trap; evaporative cooling. Although quite efficient, this process is only possible for a small subset of alkali and alkali-earth-like atoms that can be initially cooled to low temperature by optical means.The sub-Doppler cooling phase typically uses light red detuned from the F → F = F + 1 cycling transition of a D 2 line nS 1/2 → nP 3/2 [4], and can be understood in terms of the "Sisyphus effect" [5][6][7][8]. Sub-Doppler cooling schemes involving dark states (DSs) [9] have emerged as a powerful alternative; they are known as gray molasses. Very recently they have been pivotal in obtaining an alloptical BEC in microgravity [10] and a degenerate Fermi gas of polar molecules [11]. The DSs are coherent superpositions of internal and external (momentum) states that are decoupled from the optical field; their creation does not require cycling F → F = F + 1 transitions, but can rely on any transitions of the F → F ≤ F form.To prevent the expansion of the cold atom cloud during cooling, it is tempting to combine DS sub-Doppler cooling with spatial confinement in a far-off-resonance optical dipole trap (FORT). However, the DSs are then strongly modified by the trap potential, which typically shortens their lifetime and eventually couples them to the light field.In this letter, we show that DS cooling can be used in combination with FORT when strong differential light * devang.naik@institutoptique.fr † andrea.bertoldi@institutoptique.fr shift are present. We use the effect of FORT trapping light close the 5P 3/2 → 4D 3/2;5/2 transitions of rubidium at 1529 nm [12,13] to maximize the cooling action on the surrounding of the trap and at its borders. We observe an order of magnitude improvement in the number of trapped atoms. Additionally, we explore the possibility of cooling the atomic ensemble in the FORT. We achieve a notable temperature reduction of the trapped sample in a few ms and without losing atoms and analyz...

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Long-lived quantum coherence in a two-level semiconductor quantum dot

Abo-Kahla

2020

Pramana - J Phys

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Transporting Long-Lived Quantum Spin Coherence in a Photonic Crystal Fiber

Cited by 26 publications

References 32 publications

Large array of Schrödinger cat states facilitated by an optical waveguide

Large array of Schrödinger cat states facilitated by an optical waveguide

Loading and cooling in an optical trap via hyperfine dark states

Long-lived quantum coherence in a two-level semiconductor quantum dot

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