Robust and scalable optical one-way quantum computation

Wang, Hefeng; Yang, Chunzhen; Nori, Franco

doi:10.1103/physreva.81.052332

Cited by 16 publications

(16 citation statements)

References 30 publications

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“…Squeezing of photons is not easy to preserve, hence researchers considered how to transfer squeezing from photons to atomic ensembles [50,112,51,16,54], which are more convenient for storing quantum information. Many efforts have been devoted to use atomic ensembles to realize quantum memories [48,287,288], and using photons as information carriers. A practical analysis of generating spin squeezing in an ensemble of atoms, by absorption of squeezed light, was studied theoretically in [51], and soon after it was realized in experiments [16].…”

Section: Squeezing Transferred From Light To Atomsmentioning

confidence: 99%

Quantum spin squeezing

et al. 2011

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This paper reviews quantum spin squeezing, which characterizes the sensitivity of a state with respect to an SU(2) rotation, and is significant for both entanglement detection and high-precision metrology. We first present various definitions of spin squeezing parameters, explain their origin and properties for typical states, and then discuss spin-squeezed states produced with the Ising and the nonlinear twisting Hamiltonians. Afterwards, we explain correlations and entanglement in spin-squeezed states, as well as the relations between spin squeezing and quantum Fisher information, where the latter plays a central role in quantum metrology. We also review the applications of spin squeezing for detecting quantum chaos and quantum phase transitions, as well as the influence of decoherence on spin-squeezed states. Finally, several experiments are discussed including: producing spin squeezed states via particle collisions in Bose-Einstein condensates, mapping photon squeezing onto atomic ensembles, and quantum non-demolition measurements.Comment: 99 pages, 25 figure

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Section: Squeezing Transferred From Light To Atomsmentioning

confidence: 99%

Quantum spin squeezing

et al. 2011

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“…The advantages of deterministic gates were explored by exploiting ancilla-based schemes [5,[19][20][21][22]. Wang et al [23] proposed a method to transfer an atomic cluster state to photonic qubits, inverting the usual role of the qubit and ancilla between the matter and optical systems.…”

Section: Introductionmentioning

confidence: 99%

Reduce, reuse, recycle for robust cluster-state generation

et al. 2011

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Efficient generation of cluster states is crucial for engineering large-scale measurement-based quantum computers. Hybrid matter-optical systems offer a robust, scalable path to this goal. Such systems have an ancilla which acts as a bus connecting the qubits. We show that by generating the cluster in smaller sections of interlocking bricks, reusing one ancilla per brick, the cluster can be produced with maximal efficiency, requiring fewer than half the operations compared with no bus reuse. By reducing the time required to prepare sections of the cluster, bus reuse more than doubles the size of the computational workspace that can be used before decoherence effects dominate. A row of buses in parallel provides fully scalable cluster-state generation requiring only 20 controlled-PHASE gates per bus use.

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“…Cluster states [1] constitute a generic class of highly entangled quantum states, which can serve as the starting point for subsequent entirely measurement-driven universal quantum information processing [2][3][4][5][6][7][8][9][10][11][12][13]. In addition, cluster states are useful for quantum sensing [14,15] and robust to specific noise sources [16,17].…”

Section: Introductionmentioning

confidence: 99%

Coherent-cluster-state generation in networks of degenerate optical parametric oscillators

Zhou¹,

Gneiting²,

You³

et al. 2023

Preprint

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Cluster states are versatile quantum resources and an essential building block for measurementbased quantum computing. The possibility to generate cluster states in specific systems may thus serve as an indicator if and to what extent these systems can be harnessed for quantum technologies and quantum information processing in particular. Here, we apply this analysis to networks of degenerate optical parametric oscillators (DOPOs), also called coherent Ising machines (CIMs). CIMs are distinguished by their highly flexible coupling capabilities, which makes it possible to use them, e.g., to emulate large spin systems. As CIMs typically operate with coherent states (and superpositions thereof), it is natural to consider cluster states formed by superpositions of coherent states, i.e., coherent cluster states. As we show, such coherent cluster states can, under ideal conditions, be generated in DOPO networks with the help of beam splitters and classical pumps. Our subsequent numerical analysis provides the minimum requirements for the generation of coherent cluster states under realistic conditions. Moreover, we discuss how nonequilibrium pumps can improve the generation of coherent cluster states. In order to assess the quality of the cluster state generation, we map the generated states to an effective spin space using modular variables, which allows us to apply entanglement criteria tailored for spin-based cluster states.

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Robust and scalable optical one-way quantum computation

Cited by 16 publications

References 30 publications

Quantum spin squeezing

Quantum spin squeezing

Reduce, reuse, recycle for robust cluster-state generation

Coherent-cluster-state generation in networks of degenerate optical parametric oscillators

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