Quantum computation with optical coherent states

By Timothy C. Ralph, A. Gilchrist, Gerard J. Milburn, William J. Munro, S. Glancy. Quantum Electronics and Laser Science Conference, 2002

606 citations recorded by the source corpus.

Summary form only given. We discuss an efficient scheme which is elegant in its simplicity. By encoding the quantum information in multi-photon coherent states, rather than single photon states, simple optical manipulations acquire unexpected power. The required resource, which may be produced non-deterministically, is a superposition of the vacuum and a coherent state. Given this, the scheme is deterministic and requires only simple linear optics and photon counting. Qubit readout uses homodyne detection.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/844e7db14a7c92ee3887f9107c125bb449c30ffa

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Hybrid discrete- and continuous-variable quantum information (2014, background): “Universal quantum computation can be executed using a measurement induced approach where gates are implemented through teleportation [102, 103] and different gates are realized by the usage of different types of entangled states [104, 105].”
Blueprint for a Scalable Photonic Fault-Tolerant Quantum Computer (2020, background): “Examples of bosonic codes include GKP [20], dual-rail [3, 54], cat [55, 56], hypercat [57, 58], binomial [59], and general rotation-symmetric codes [60].”
Remote creation of hybrid entanglement between particle-like and wave-like optical qubits (2013, background): “In the continuous alternative, the encoding is realized in the quadrature components of a light field, in an inherently infinite-dimensional space, and the qubits, also sometimes called qumodes [6], can be implemented for instance as arbitrary superpositions of classical light waves with opposite ph”
Linear optical quantum computing with photonic qubits (2005, background): “Finally, an alternative approach to linear optical quantum computing involves encoding qubits in squeezed or coherent states of light (Gottesman et al. 2001; Ralph et al. 2003).”
Near-deterministic quantum teleportation and resource-efficient quantum computation using linear optics and hybrid qubits (2011, methodology): “In CSQC, two coherent states, | α (cid:105) and |− α (cid:105) with amplitudes ± α , are used to form a qubit basis and equal superpositions of coherent states, e.g., | α + α [16], are required as resources [14].”
Performance and structure of single-mode bosonic codes (2017, background): “This code cannot detect loss events since losing a photon causes a logical bit-ﬂip, but it of course can be concatenated with, e.g., a bit-ﬂip code [85].”
Preparation of non-local superpositions of quasi-classical light states (2009, background): “[8] Ralph, T.”
Fault-tolerant bosonic quantum error correction with the surface–Gottesman-Kitaev-Preskill code (2019, background): “Continuous-variable systems or bosonic modes are ubiquitous in many quantum computing platforms and there have been various proposals for realizing quantum computation in continuous-variable systems [1–4].”
Enlargement of optical Schrödinger's cat states (2016, background): “can serve as a basis for quantum computation [8, 9], metrology [10], teleportation and cryptography [11–13].”