Preparing Narrow Velocity Distributions for Quantum Memories in Room-Temperature Alkali Vapours

• URL: http://arxiv.org/abs/2011.03766v1
• Date: Sat, 7 Nov 2020 12:46:25 GMT
• Title: Preparing Narrow Velocity Distributions for Quantum Memories in Room-Temperature Alkali Vapours
• Authors: D. Main, T. M. Hird, S. Gao, E. Oguz, D. J. Saunders, I. A. Walmsley, P. M. Ledingham
• Abstract summary: Quantum memories are crucial for enabling large-scale quantum networks through synchronisation of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapour platforms are promising candidates.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum memories are a crucial technology for enabling large-scale quantum networks through synchronisation of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapour platforms are promising candidates, combining efficient high-bandwidth operation with low-noise on-demand retrieval. However, their storage time is severely limited by motion-induced dephasing caused by the broad velocity distribution of atoms comprising the vapour. In this paper, we demonstrate velocity selective optical pumping to overcome this decoherence mechanism. This will increase the achievable memory storage time of vapour memories. This technique can also be used for preparing arbitrarily shaped absorption profiles, for instance, preparing an atomic frequency comb absorption feature.

Related papers

• Efficient cavity-assisted storage of photonic qubits in a solid-state quantum memory [55.41644538483948]
  We report on the high-efficiency storage and retrieval of weak coherent optical pulses and photonic qubits in a cavity solid-state quantum memory. We store weak coherent pulses at the single photon level with up to 62% efficiency for a pre-determined storage time of 2 $mu$s. We then store weak coherent time-bin qubits with (51+-2)% efficiency and a measurement-device limited fidelity over (94.8+-1.4)% for the retrieved qubits.
  arXiv  Detail & Related papers  (2023-07-07T10:55:09Z)
• Entanglement Distribution in Quantum Repeater with Purification and Optimized Buffer Time [53.56179714852967]
  We explore entanglement distribution using quantum repeaters with optimized buffer time. We observe that increasing the number of memories on end nodes leads to a higher entanglement distribution rate per memory. When imperfect operations are considered, however, we make the surprising observation that the per-memory entanglement rate decreases with increasing number of memories.
  arXiv  Detail & Related papers  (2023-05-23T23:23:34Z)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• High-performance cavity-enhanced quantum memory with warm atomic cell [1.0539847330971805]
  We report a high-performance cavity-enhanced electromagnetically-induced-transparency memory with warm atomic cell. It has been experimentally demonstrated that the average fidelities for a set of input coherent states with different phases and amplitudes within a Gaussian distribution have exceeded the classical benchmark fidelities.
  arXiv  Detail & Related papers  (2022-06-17T01:59:26Z)
• Field-deployable Quantum Memory for Quantum Networking [62.72060057360206]
  We present a quantum memory engineered to meet real-world deployment and scaling challenges. The memory technology utilizes a warm rubidium vapor as the storage medium, and operates at room temperature. We demonstrate performance specifications of high-fidelity retrieval (95%) and low operation error $(10-2)$ at a storage time of 160 $mu s$ for single-photon level quantum memory operations.
  arXiv  Detail & Related papers  (2022-05-26T00:33:13Z)
• Time Series Quantum Reservoir Computing with Weak and Projective Measurements [0.0]
  We show that it is possible to exploit the quantumness of the reservoir and to obtain ideal performance. One consists in rewinding part of the dynamics determined by the fading memory of the reservoir and storing the corresponding data of the input sequence. The other employs weak measurements operating online at the trade-off where information can be extracted accurately and without hindering the needed memory.
  arXiv  Detail & Related papers  (2022-05-13T17:57:39Z)
• Multimode capacity of atomic-frequency comb quantum memories [48.7576911714538]
  Ensemble-based quantum memories are key to developing multiplexed quantum repeaters. Rare-earth ion doped crystals are main candidates for highly multimode quantum memories. AFC quantum memory provides large temporal multimode capacity.
  arXiv  Detail & Related papers  (2022-02-24T22:07:01Z)
• Fast Swapping in a Quantum Multiplier Modelled as a Queuing Network [64.1951227380212]
  We propose that quantum circuits can be modeled as queuing networks. Our method is scalable and has the potential speed and precision necessary for large scale quantum circuit compilation.
  arXiv  Detail & Related papers  (2021-06-26T10:55:52Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.