Efficient quantum memory for single-photon polarization qubits

Wang, Yunfei; Li, Jianfeng; Zhang, Shanchao; Su, Keyu; Zhou, Yunfeng; Liao, Kai-Yu; Du, Shengwang; Yan, Hui; Zhu, Shi-Liang

doi:10.1038/s41566-019-0368-8

Cited by 267 publications

(176 citation statements)

References 38 publications

Supporting

Mentioning

166

Contrasting

Unclassified

Order By: Relevance

“…Indeed, work towards confinement of atoms and light fields on the micro-and nanoscales has increasingly offered diverse access to studying fundamental physics [19][20][21][22][23][24][25][26][27], sensing [10,[28][29][30][31][32], miniaturization of optical devices [1,7,33], and quantum technologies [34][35][36][37][38][39]. Although the first atom-on-chip attempts date back about two decades [40,41], the difficulties of taming surface effects such as van der Waals forces [42][43][44] have rendered the control of cold atoms at nanoscopic distances elusive [45].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Alkali-Metal Vapor Cells

et al. 2020

View full text Add to dashboard Cite

Atom-light interactions in micro-and nanoscale systems hold great promise for alternative technologies based on integrated emitters and optical modes. We present the design architecture, construction method, and characterization of an all-glass alkali-metal vapor cell with nanometer-scale internal structure. Our cell has a glue-free design that allows versatile optical access, in particular with high numerical aperture optics, and incorporates a compact integrated heating system in the form of an external deposited indium tin oxide layer. By performing spectroscopy in different illumination and detection schemes, we investigate atomic densities and velocity distributions in various nanoscopic landscapes. We apply a two-photon excitation scheme to atoms confined in one dimension within our cells, achieving resonance line widths more than an order of magnitude smaller than the Doppler width. We also demonstrate sub-Doppler line widths for atoms confined in two dimensions to micron-sized channels. Furthermore, we illustrate control over vapor density within our cells through nanoscale confinement alone, which could offer a scalable route towards room-temperature devices with single atoms within an interaction volume. Our design offers a robust platform for miniaturized devices that could easily be combined with integrated photonic circuits.

show abstract

Section: Introductionmentioning

confidence: 99%

Nanostructured Alkali-Metal Vapor Cells

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Cold atomic gases are currently one of the best quantum memory platforms with excellent properties demonstrated, including single photon storage and retrieval efficiency up to 90 % [4][5][6][7][8] and storage time up to 220 ms [5,9]. In particular, this system is well suited for realizing a photon pair source with embedded quantum memory following the Duan-Lukin-Cirac-Zoller protocol [10], that can be used as a quantum repeater node [11][12][13].…”

mentioning

confidence: 99%

A cold-atom temporally-multiplexed quantum repeater node with cavity-enhanced noise suppression (Conference Presentation)

Heller

Farrera

Heinze

et al. 2020

Quantum Technologies 2020

View full text Add to dashboard Cite

Future quantum repeater architectures, capable of efficiently distributing information encoded in quantum states of light over large distances, will benefit from multiplexed photonic quantum memories. In this work we demonstrate a temporally multiplexed quantum repeater node in a laser-cooled cloud of 87 Rb atoms. We employ the DLCZ protocol where pairs of photons and single collective spin excitations (so called spin waves) are created in several temporal modes using a train of write pulses. To make the spin waves created in different temporal modes distinguishable and enable selective readout, we control the dephasing and rephasing of the spin waves by a magnetic field gradient, which induces a controlled reversible inhomogeneous broadening of the involved atomic hyperfine levels. We demonstrate that by embedding the atomic ensemble inside a low finesse optical cavity, the additional noise generated in multi-mode operation is strongly suppressed. By employing feed forward readout, we demonstrate distinguishable retrieval of up to 10 temporal modes. For each mode, we prove non-classical correlations between the first and second photon. Furthermore, an enhancement in rates of correlated photon pairs is observed as we increase the number of temporal modes stored in the memory. The reported capability is a key element of a quantum repeater architecture based on multiplexed quantum memories.Quantum light-matter interfaces are key platforms in the field of quantum information. They provide storage, processing or synchronization of photonic quantum states, which can be used for applications in quantum communication, computation or sensing [1, 2]. One example is optical quantum memories, devices able to store and retrieve photonic quantum states. Multiplexed optical quantum memories are important in order to achieve higher data communication rates, as it is similarly done in conventional classical communications. One particularly interesting application of multiplexed quantum memories is to enhance the entanglement distribution rate in quantum repeaters [3], which in turn also facilitate their practical realization by relaxing the storage time requirements. For this application, the quantum memory should be able to store a large number of distinguishable modes and to read them out selectively. Different degrees of freedom have been considered for the multiplexed modes, such as frequency, space or time. Ensemble-based platforms, where photonic quantum information is mapped onto collective atomic excitations, are well suited for demonstrating quantum information multiplexing.Cold atomic gases are currently one of the best quantum memory platforms with excellent properties demonstrated, including single photon storage and retrieval efficiency up to 90 % [4-8] and storage time up to 220 ms [5,9]. In particular, this system is well suited for realizing a photon pair source with embedded quantum memory following the Duan-Lukin-Cirac-Zoller protocol [10], that can be used as a quantum repeater node [11][12][13]. Current multi...

show abstract

“…Finally, one could adopt these ideas to the field of quantum optics [77]. Photon polarization has been used as a qubit, for example, in the process of storing and then retrieving quantum information in cold-atom platforms [78]. More directly related to our ideas are two polarization-based qubits (one serving as system and the other as detector), allowing for back-action control [79].…”

Section: Macroscopic Mechanical Objectsmentioning

confidence: 99%

Measurement-induced steering of quantum systems

Roy

Chalker

Gornyi

et al. 2020

Phys. Rev. Research

View full text Add to dashboard Cite

We set out a general protocol for steering the state of a quantum system from an arbitrary initial state toward a chosen target state by coupling it to auxiliary quantum degrees of freedom. The protocol requires multiple repetitions of an elementary step: During each step, the system evolves for a fixed time while coupled to auxiliary degrees of freedom (which we term "detector qubits") that have been prepared in a specified initial state. The detectors are discarded at the end of the step, or equivalently, their state is determined by a projective measurement with an unbiased average over all outcomes. The steering harnesses backaction of the detector qubits on the system, arising from entanglement generated during the coupled evolution. We establish principles for the design of the system-detector coupling that ensure steering of a desired form. We illustrate our general ideas using both few-body examples (including a pair of spins-1/2 steered to the singlet state) and a many-body example (a spin-1 chain steered to the Affleck-Kennedy-Lieb-Tasaki state). We study the continuous time limit in our approach and discuss similarities to (and differences from) drive-and-dissipation protocols for quantum state engineering. Our protocols are amenable to implementations using present-day technology. Obvious extensions of our analysis include engineering of other many-body phases in one and higher spatial dimensions, adiabatic manipulations of the target states, and the incorporation of active error correction steps.

show abstract

Efficient quantum memory for single-photon polarization qubits

Cited by 267 publications

References 38 publications

Nanostructured Alkali-Metal Vapor Cells

Nanostructured Alkali-Metal Vapor Cells

A cold-atom temporally-multiplexed quantum repeater node with cavity-enhanced noise suppression (Conference Presentation)

Measurement-induced steering of quantum systems

Contact Info

Product

Resources

About