Quantum information processing with a travelling wave of light

Serikawa, Tadashi; Shiozawa, Yu; Ogawa, Hisashi; Takanashi, Naoto; Takeda, Shuntaro; Yoshikawa, Jun–ichi; Furusawa, Akira

doi:10.1117/12.2289039

Cited by 3 publications

(6 citation statements)

References 52 publications

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“…Similarly, optimal control in terms of energy or time can be achieved when procedures such as those in [9,10] are adapted to each block in the depicted structure. More ambitious ideas about the control of quantum processing such as the use of traveling waves, ion traps, resonant cavities, or superconducting circuits [37][38][39][40] could be adapted to the architectures presented here.…”

Section: Discussionmentioning

confidence: 99%

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SU(2) Decomposition for the Quantum Information Dynamics in 2d-Partite Two-Level Quantum Systems

Delgado

2018

Entropy

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Abstract:The gate array version of quantum computation uses logical gates adopting convenient forms for computational algorithms based on the algorithms classical computation. Two-level quantum systems are the basic elements connecting the binary nature of classical computation with the settlement of quantum processing. Despite this, their design depends on specific quantum systems and the physical interactions involved, thus complicating the dynamics analysis. Predictable and controllable manipulation should be addressed in order to control the quantum states in terms of the physical control parameters. Resources are restricted to limitations imposed by the physical settlement. This work presents a formalism to decompose the quantum information dynamics in SU(2 2d ) for 2d-partite two-level systems into 2 2d−1 SU(2) quantum subsystems. It generates an easier and more direct physical implementation of quantum processing developments for qubits. Easy and traditional operations proposed by quantum computation are recovered for larger and more complex systems. Alternating the parameters of local and non-local interactions, the procedure states a universal exchange semantics on the basis of generalized Bell states. Although the main procedure could still be settled on other interaction architectures by the proper selection of the basis as natural grammar, the procedure can be understood as a momentary splitting of the 2d information channels into 2 2d−1 pairs of 2 level quantum information subsystems. Additionally, it is a settlement of the quantum information manipulation that is free of the restrictions imposed by the underlying physical system. Thus, the motivation of decomposition is to set control procedures easily in order to generate large entangled states and to design specialized dedicated quantum gates. They are potential applications that properly bypass the general induced superposition generated by physical dynamics.

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Section: Discussionmentioning

confidence: 99%

“…Because of the space and complexity, we do not express U k (t) in terms of the original coefficients in (A9) and (A10). In any case, formulas (31)- (37) are sufficiently efficient to reproduce the entries of each Hamiltonian. Instead, after expressing both Hamiltonians in the GBS basis, they become (as in (28)):…”

Section: Entanglement Dynamics Under Interactionsmentioning

confidence: 99%

SU(2) Decomposition for the Quantum Information Dynamics in 2d-Partite Two-Level Quantum Systems

Delgado

2018

Entropy

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“…Similarly, optimal control in terms of energy or time can be achieved when procedures as those in [6,7] are adapted to each block in the depicted structure. More ambitious ideas about the control of quantum processing as the use of wave traveling, ion traps, resonant cavities or superconducting circuits [27][28][29][30] could be adapted to the architectures presented here.…”

Section: Discussionmentioning

confidence: 99%

“…If the Hamiltonian coefficients involved in the block are time independent, then the corresponding S U I,I block in the evolution matrix becomes: is imaginary only if j s or j d+s is 2. Thus, only one component from n 1 or n 2 is different from zero because non-diagonal entries of block in (27,29,30) are always real or imaginary. It reduces the optimal control to the second case reported by [6].…”

Section: General Structure Of Su(2) Blocksmentioning

confidence: 99%

“…4,s with a non-local and non-crossed interaction in the direction j for the group of non-correspondent terms defined by k < k ≤ d. The Hamiltonian entries are similar to those in (27)(28)(29) but with the last restriction for the non-correspondent terms of interaction. Due to discussion in the previous subsection, diagonal-off entries in the Hamiltonian are now always real.…”

Section: Blocks In Type II Interactionmentioning

confidence: 99%

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SU(2) Decomposition for the Quantum Information Dynamics in 2<em>d</em>-Partite Two-Level Quantum Systems

Delgado¹

2018

Preprint

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Quantum Computation, in the gate array version, uses logical gates adopting convenient forms for computational algorithms based on those of classical computation. There, two-level quantum systems are the basic elements connecting the binary nature of classical computation with the settlement of quantum processing. Despite, their design depends on specific quantum systems and physical interactions involved, exacerbating the dynamics analysis. Predictable and controllable manipulation should be addressed to control the quantum states, but resources are restricted to limitations imposed by the physical settlement. This work presents a formalism to decompose the quantum information dynamics in SU(2 2d ) for 2d-partite two-level systems into 2 2d−1 SU(2) quantum subsystems. Decomposition lets to set control procedures, to generate large entangled states and to design specialized dedicated quantum gates. There, easy and traditional operations proposed by quantum computation are recovered for more complex and large systems. Alternating the parameters of local and non-local interactions, the procedure states a universal exchange semantics on the generalized Bell states basis. It could be understood as a momentary splitting of the 2d information channels into 2 2d−1 pairs of 2 level quantum information subsystems and a settlement of the quantum information manipulation free of the imposed restrictions by the underlying physical system.

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Generation and measurement of a squeezed vacuum up to 100 MHz at 1550 nm with a semi-monolithic optical parametric oscillator designed towards direct coupling with waveguide modules

et al. 2019

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We report generation and measurement of a squeezed vacuum from a semimonolithic Fabry-Pérot optical parametric oscillator (OPO) up to 100 MHz at 1550 nm. The output coupler of the OPO is a flat surface of a nonlinear crystal with partially reflecting coating, which enables direct coupling with waveguide modules. Using the OPO, we observed 6.2dB of squeezing at 2 MHz and 3.0 dB of squeezing at 100 MHz. The OPO operates at the optimal wavelength to minimize propagation losses in silica waveguides and looks towards solving a bottleneck of downsizing these experiments: that of coupling between a squeezer and a waveguide.

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Quantum information processing with a travelling wave of light

Cited by 3 publications

References 52 publications

SU(2) Decomposition for the Quantum Information Dynamics in 2d-Partite Two-Level Quantum Systems

SU(2) Decomposition for the Quantum Information Dynamics in 2d-Partite Two-Level Quantum Systems

SU(2) Decomposition for the Quantum Information Dynamics in 2<em>d</em>-Partite Two-Level Quantum Systems

Generation and measurement of a squeezed vacuum up to 100 MHz at 1550 nm with a semi-monolithic optical parametric oscillator designed towards direct coupling with waveguide modules

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