Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders

• URL: http://arxiv.org/abs/2206.07607v1
• Date: Wed, 15 Jun 2022 15:37:43 GMT
• Title: Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders
• Authors: Feifei Zhou, Yu Tian, Yumeng Song, Chudan Qiu, Xiangyu Wang, Mingti Zhou, Bing Chen, Nanyang Xu, and Dawei Lu
• Abstract summary: Entanglement, as a key resource for modern quantum technologies, is extremely fragile due to the decoherence. We show that a quantum autoencoder, which is trained to compress a particular set of quantum entangled states into a subspace that is robust to decoherence, can be employed to preserve entanglement.
• Score: 12.214186598448523
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement, as a key resource for modern quantum technologies, is extremely fragile due to the decoherence. Here, we show that a quantum autoencoder, which is trained to compress a particular set of quantum entangled states into a subspace that is robust to decoherence, can be employed to preserve entanglement. The training process is based on a hybrid quantum-classical approach to improve the efficiency in building the autoencoder and reduce the experimental errors during the optimization. Using nitrogen-vacancy centers in diamond, we demonstrate that the entangled states between the electron and nuclear spins can be encoded into the nucleus subspace which has much longer coherence time. As a result, lifetime of the Bell states in this solid-spin system is extended from 2.22 {\pm} 0.43 {\mu}s to 3.03 {\pm} 0.56 ms, yielding a three orders of magnitude improvement. The quantum autoencoder approach is universal, paving the way of utilizing long lifetime nuclear spins as immediate-access quantum memories in quantum information tasks.

Related papers

• Universal Quantum Optimization with Cold Atoms in an Optical Cavity [14.568979066292918]
  We show the atom cavity system is universal for quantum optimization with arbitrary connectivity. We consider a single-mode cavity and develop a Raman coupling scheme by which the engineered quantum Hamiltonian for atoms directly encodes number partition problems.
  arXiv  Detail & Related papers  (2023-06-29T13:42:19Z)
• Fault-tolerant qubit encoding using a spin-7/2 qudit [4.678423453820858]
  We propose a quantum memory, implemented on a spin-7/2 nucleus hyperfine-coupled to an electron spin-1/2 qubit. Our encoding may be efficiently implemented in existing experimentally realised molecular electron-nuclear quantum spin systems.
  arXiv  Detail & Related papers  (2023-03-03T16:57:58Z)
• 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)
• Robust quantum-network memory based on spin qubits in isotopically engineered diamond [0.0]
  We show that a single 13C spin in isotopically engineered diamond offers a long-lived quantum memory that is robust to the optical link operation of an NV centre. Our results pave the way for test-bed quantum networks capable of investigating complex algorithms and error correction.
  arXiv  Detail & Related papers  (2021-11-18T16:13:45Z)
• On exploring the potential of quantum auto-encoder for learning quantum systems [60.909817434753315]
  We devise three effective QAE-based learning protocols to address three classically computational hard learning problems. Our work sheds new light on developing advanced quantum learning algorithms to accomplish hard quantum physics and quantum information processing tasks.
  arXiv  Detail & Related papers  (2021-06-29T14:01:40Z)
• Hardware-Efficient, Fault-Tolerant Quantum Computation with Rydberg Atoms [55.41644538483948]
  We provide the first complete characterization of sources of error in a neutral-atom quantum computer. We develop a novel and distinctly efficient method to address the most important errors associated with the decay of atomic qubits to states outside of the computational subspace. Our protocols can be implemented in the near-term using state-of-the-art neutral atom platforms with qubits encoded in both alkali and alkaline-earth atoms.
  arXiv  Detail & Related papers  (2021-05-27T23:29:53Z)
• Decoherence-free quantum register of nuclear spins in diamond [0.0]
  We propose a quantum register that lies in a decoherence-free subspace to be implemented with color centers in diamond. The quantum information is encoded in two logical states composed of two nearby nuclear spins.
  arXiv  Detail & Related papers  (2021-04-19T22:16:01Z)
• Coherence and entanglement of inherently long-lived spin pairs in diamond [0.0]
  We show that pairs of identical nuclear spins in solids form intrinsically long-lived quantum systems. We realize high-fidelity measurements of their quantum states using a single NV center in their vicinity. These long-lived qubits are abundantly present in diamond and other solids, and provide new opportunities for quantum sensing, quantum information processing, and quantum networks.
  arXiv  Detail & Related papers  (2021-03-14T16:05:10Z)
• Imaginary Time Propagation on a Quantum Chip [50.591267188664666]
  Evolution in imaginary time is a prominent technique for finding the ground state of quantum many-body systems. We propose an algorithm to implement imaginary time propagation on a quantum computer.
  arXiv  Detail & Related papers  (2021-02-24T12:48:00Z)
• Universal quantum computation and quantum error correction with ultracold atomic mixtures [47.187609203210705]
  We propose a mixture of two ultracold atomic species as a platform for universal quantum computation with long-range entangling gates. One atomic species realizes localized collective spins of tunable length, which form the fundamental unit of information. We discuss a finite-dimensional version of the Gottesman-Kitaev-Preskill code to protect quantum information encoded in the collective spins.
  arXiv  Detail & Related papers  (2020-10-29T20:17:14Z)
• Quantum Gram-Schmidt Processes and Their Application to Efficient State Read-out for Quantum Algorithms [87.04438831673063]
  We present an efficient read-out protocol that yields the classical vector form of the generated state. Our protocol suits the case that the output state lies in the row space of the input matrix. One of our technical tools is an efficient quantum algorithm for performing the Gram-Schmidt orthonormal procedure.
  arXiv  Detail & Related papers  (2020-04-14T11:05:26Z)

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.