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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Quantum memory based on coherence transfer

Sergey A. Moiseev, Byoung Seung HAM

Published Oct 19, 2004• 0 citations
Publisher

Abstract

We analytically demonstrate a quantum memory based on coherence transfer for manipulating quantum states of photons interacting with a macroscopic medium. The present quantum memory has potential for quantum information and communications using entanglement storage and retrieval. Using this technique the quantum coherent control of a quantum state is effectively possible by simply varying the classical laser parameters.

DOI
10.1117/12.561585

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We analytically demonstrate a quantum memory based on coherence transfer for manipulating quantum states of photons interacting with a macroscopic medium. The present quantum memory has potential for quantum information and communications using entanglement storage and retrieval. Using this technique the quantum coherent control of a quantum state is effectively possible by simply varying the classical laser parameters.
Quantum entanglement plays a central role for implementing quantum information processing. Deterministic control of quantum entanglement has been realized using a squeezed vacuum state. However, since photons are hard to localize, coherent transfer of quantum squeezing between information carrying photons and spatially localized atoms has long been desired. This coherent transfer is equivalent to the storage and retrieval of quantum entanglement and is one of the most important building blocks for implementing the intricate tasks of quantum information processing. Here, for the first time, we successfully demonstrate the storage and retrieval of a squeezed vacuum state with electromagnetically induced transparency using a cold ensemble of Rb atoms as a memory medium.
Controlled manipulation, storage and retrieval of quantum information is essential for quantum communication and computing. Quantum memories for light, realized with cold atomic samples as the storage medium, are prominent for their high storage efficiencies and lifetime. We demonstrate the controlled transport of stored light over 2.4 mm in such a storage system and show that the transport process and its dynamics only have a minor effect on the coherence of the storage. Extending the presented concept to longer transport distances and augmenting the number of storage sections will allow for the development of novel quantum devices such as optical race track memories or optical quantum registers.
Controlled manipulation, storage, and retrieval of quantum information is essential for quantum communication and computing. Quantum memories for light, realized with cold atomic samples as the storage medium, are prominent for their high storage efficiencies and lifetime. We demonstrate the controlled transport of stored light over 1.2 mm in such a storage system and show that the transport process and its dynamics only have a minor effect on the coherence of the storage. Extending the presented concept to longer transport distances and augmenting the number of storage sections will allow for the development of novel quantum devices such as optical racetrack memories or optical quantum registers.
This paper explores the potential of utilizing quantum entanglement for advanced memory storage and retrieval systems. The core claim presented is that leveraging multi-particle quantum entanglement offers a pathway to significantly enhance information storage density and retrieval precision, effectively addressing limitations inherent in classical information storage paradigms. The proposed mechanism involves the creation of highly coherent entangled states through precise control and manipulation of multiple quantum bits, typically within superconducting circuits or quantum bit arrays. Information retrieval is then achieved by selectively measuring specific portions of these entangled states, extracting the stored information with high accuracy. We argue that this approach, compared to traditional quantum storage methods reliant on error-correcting codes, offers a more robust and intrinsically advantageous error mitigation strategy, particularly in confronting the challenges of quantum decoherence. The theoretical framework presented outlines key considerations for designing and implementing such a system, focusing on entanglement generation, state preservation, and measurement protocols. Furthermore, we discuss the potential implications of this technology across various sectors, including high-performance computing and secure communication. ---
This paper explores the potential of utilizing quantum state decoherence as a fundamental mechanism for constructing a high-density and high-fidelity quantum memory. The core concept relies on exploiting quantum bit (qubit) interactions to store and retrieve quantum states, coupled with the inherent properties of decoherence to maintain coherence for extended periods. We propose a framework leveraging controlled interactions between qubits to encode quantum information, followed by a carefully designed decoherence process to effectively 'lock' the state. The key challenge addressed is minimizing information loss during both storage and retrieval. The theoretical analysis focuses on the trade-offs between coherence time, storage capacity, and fidelity, providing a basis for future research and development in this critical area of quantum information processing. We present a simplified model to illustrate the principles involved and discuss potential avenues for improvement, highlighting the importance of precise control and mitigation strategies to combat decoherence effects. ---