Gain tuning for continuous-variable quantum teleportation of discrete-variable states

Takeda, Shuntaro; Mizuta, Takahiro; Fuwa, Maria; Yonezawa, Hidehiro; Loock, Peter van; Furusawa, Akira

doi:10.1103/physreva.88.042327

Cited by 26 publications

(43 citation statements)

References 44 publications

(102 reference statements)

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“…Due to its potential applications in high-precision measurements like gravitational wave detection [19], quantum teleportation [20], * ferpo@fis.ucm.es and quantum computing [21], the squeezing of the fluorescent field has been widely studied in two-and three-level atoms driven by laser fields [22]. In connection with the development of quantum informatics, squeezed states of the radiation field have been recognized as crucial resources for continuous variable quantum information processing [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Optical and microwave control of resonance fluorescence and squeezing spectra in a polar molecule

et al. 2017

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A two-level quantum emitter with broken inversion symmetry simultaneously driven by an optical field and a microwave field that couples to the permanent dipole's moment is presented. We focus to a situation where the angular frequency of the microwave field is chosen such that it closely matches the Rabi frequency of the optical field, the so-called Rabi resonance condition. Using a series of unitary transformations we obtain an effective Hamiltonian in the double-dressed basis which results in easily solvable Bloch equations which allow us to derive analytical expressions for the spectrum of the scattered photons. We analyze the steady-state population inversion of the system which shows a distinctive behavior at the Rabi resonance with regard to an ordinary two-level nonpolar system. We show that saturation can be produced even in the case that the optical field is far detuned from the transition frequency, and we demonstrate that this behavior can be controlled through the intensity and the angular frequency of the microwave field. The spectral properties of the scattered photons are analyzed and manifest the emergence of a series of Mollow-like triplets which may be spectrally broadened or narrowed for proper values of the amplitude and/or frequency of the low-frequency field. We also analyze the phase-dependent spectrum which reveals that a significant enhancement or suppression of the squeezing at certain sidebands can be produced. These quantum phenomena are illustrated in a recently synthesized molecular complex with high nonlinear optical response although they can also occur in other quantum systems with broken inversion symmetry.

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Section: Introductionmentioning

confidence: 99%

Optical and microwave control of resonance fluorescence and squeezing spectra in a polar molecule

et al. 2017

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“…2 In this paper, we assume that there is no loss at this beam-splitter. When the loss is taken into account, see [14]. respectively, where i indicates the mode, and j denotes the imaginary unit.…”

Section: Attenuation On a CV Teleportation Channelmentioning

confidence: 99%

Hybrid Entanglement Swapping for Satellite-Based Quantum Communications

Do¹,

Malaney²,

Green

2019

2019 IEEE Global Communications Conference (GLOBECOM)

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Hybrid entanglement swapping supports the teleportation of any arbitrary states, regardless of whether the quantum information in the state is encoded in Discrete Variables (DV) or Continuous Variables (CV). In this work, we study the CV teleportation channel created between two ground receivers via direct lossy-distribution from a low-Earth-orbit (LEO) satellite. Such a flexible teleportation protocol has the potential to interconnect a global array of quantum-enabled devices regardless of the different intrinsic technology upon which the devices are built. However, past studies of hybrid entanglement swapping have not accounted for channel transmission loss. Here we derive the general framework for teleporting an arbitrary input mode over a lossy CV teleportation channel. We investigate the specific case where the input modes are part of DV states entangled in the photon number basis, then identify the optimal teleportation strategy. Our results show that, relative to DV photon-number entanglement sourced directly from the satellite, there are circumstances where our teleported DV states retain higher entanglement quality. We discuss the implications of our new results in the context of generating a global network of ultra-secure communications between different quantumenabled devices which possess line-of-sight connections to LEO satellites. Specifically, we illustrate the impact the teleportation process has on the key rates from a Quantum Key Distribution protocol.

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“…Another scheme which uses CV states to mediate DV entanglement was considered by Takeda et al [25]; this method has also been investigated experimentally [26]. This scheme is all optical and mediates photonic qubit entanglement, either single or dual-rail, through the use of CV entanglement in the form of EPR pairs.…”

Section: Non-gaussianmentioning

confidence: 99%

Continuous-Variable Entanglement Swapping

Marshall

Weedbrook²

2015

Entropy

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We present a very brief overview of entanglement swapping as it relates to continuous-variable quantum information. The technical background required is discussed and the natural link to quantum teleportation is established before discussing the nature of Gaussian entanglement swapping. The limitations of Gaussian swapping are introduced, along with the general applications of swapping in the context of to quantum communication and entanglement distribution. In light of this, we briefly summarize a collection of entanglement swapping schemes which incorporate a non-Gaussian ingredient and the benefits of such schemes are noted. Finally, we motivate the need to further study and develop such schemes by highlighting requirements of a continuous-variable repeater.

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Gain tuning for continuous-variable quantum teleportation of discrete-variable states

Cited by 26 publications

References 44 publications

Optical and microwave control of resonance fluorescence and squeezing spectra in a polar molecule

Optical and microwave control of resonance fluorescence and squeezing spectra in a polar molecule

Hybrid Entanglement Swapping for Satellite-Based Quantum Communications

Continuous-Variable Entanglement Swapping

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