Heralded creation of photonic qudits from parametric down-conversion using linear optics

Yoshikawa, Jun–ichi; Bergmann, Marcel; Loock, Peter van; Fuwa, Maria; Okada, Masanori; Takase, Kan; Toyama, Takeshi; Makino, Kenzo; Takeda, Shuntaro; Furusawa, Akira

doi:10.1103/physreva.97.053814

Cited by 28 publications

(31 citation statements)

References 20 publications

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“…Table 3. Values of the beam splitter parameters (−) , (−) use of which in optical scheme 50 ensures the generation of needed two-mode entangled state (17). Application of the displacement with amplitudes and ′ in Fig.…”

Section: Generation Of Scq From a Two-mode Entangled Statementioning

confidence: 99%

Efficient production of large-size optical Schrödinger cat states

Mikheev

Pugin

Kuts

et al. 2019

Sci Rep

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We present novel theory of effective realization of large-size optical Schrödinger cat states, which play an important role for quantum communication and quantum computation in the optical domain using laser sources. The treatment is based on the α-representation in infinite Hilbert space which is the decomposition of an arbitrary quantum state in terms of displaced number states characterized by the displacement amplitude α. We find analytical form of the α-representation for both even and odd Schrödinger cat states which is essential for their generation schemes. Two schemes are proposed for generating even/odd Schrödinger cat states of large size |β| (|β| ≥ 2) with high fidelity F (F ≈ 0.99). One scheme relies on an initially offline prepared two-mode entangled state with a fixed total photon number, while the other scheme uses separable photon Fock states as the input. In both schemes, generation of the desired states is heralded by the corresponding measurement outcomes. Conditions for obtaining states useful for quantum information processing are established and success probabilities for their generation are evaluated.

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Section: Generation Of Scq From a Two-mode Entangled Statementioning

confidence: 99%

Efficient production of large-size optical Schrödinger cat states

Mikheev

Pugin

Kuts

et al. 2019

Sci Rep

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“…This is an intriguing example of genuine non-Gaussian entangled state significantly outperforming state which is also non-Gaussian but with entanglement created only by Gaussian operations. This opens up an interesting avenue of research: while the conditional techniques for preparation of single mode superpositions of Fock states are well known [20,30,37], preparation of multi-mode state has been devised only for specific classes of states [38,39]…”

Section: Summary and Discussionmentioning

confidence: 99%

Deterministic multi-mode nonlinear coupling for quantum circuits

2019

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We present a general technique for deterministically implementing a multi-mode nonlinear coupling between several propagating microwave or optical modes in quantum circuits. The measurement induced technique combines specifically prepared resource states together with feasible feed-forward operations. We explore several ways of generating the suitable resource states and discuss their difference on an illustrative example of cubic coupling between two modes. We also show that the required entangled states with requisite nonlinear properties can be already generated in the present day experiments.

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“…However, we stress that this particular manifestation of our work highlights only a narrow aspect of our system, which can be more generally applied to higher photon and mode numbers as required in CVCS quantum computation. As for higher photon numbers, it is already theoretically known that we can directly generate arbitrary two-mode states with a fixed photon number, [19]. This corresponds to encoding a single spin of arbitrary size into two optical field modes [20].…”

Section: Fig 1 Possible Concept For Fault-tolerant Universal Quan-mentioning

confidence: 99%

Generation and Storage of Entanglement between Two All-Optical Quantum Memories

Okamoto¹,

Hashimoto²,

Yoshikawa³

et al. 2018

Frontiers in Optics / Laser Science

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Optical approaches to quantum computation require the creation of multi-mode photonic quantum states in a controlled fashion. Here we experimentally demonstrate phase locking of two all-optical quantum memories, based on a concatenated cavity system with phase reference beams, for the time-controlled release of two-mode entangled single-photon states. The release time for each mode can be independently determined. The generated states are characterized by two-mode optical homodyne tomography. Entanglement and nonclassicality are preserved for release-time differences up to 400 ns, confirmed by logarithmic negativities and Wigner-function negativities, respectively.

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Heralded creation of photonic qudits from parametric down-conversion using linear optics

Cited by 28 publications

References 20 publications

Efficient production of large-size optical Schrödinger cat states

Efficient production of large-size optical Schrödinger cat states

Deterministic multi-mode nonlinear coupling for quantum circuits

Generation and Storage of Entanglement between Two All-Optical Quantum Memories

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