372 research outputs found
High-threshold fault-tolerant quantum computation with analog quantum error correction
To implement fault-tolerant quantum computation with continuous variables,
the Gottesman-Kitaev-Preskill (GKP) qubit has been recognized as an important
technological element. However,it is still challenging to experimentally
generate the GKP qubit with the required squeezing level, 14.8 dB, of the
existing fault-tolerant quantum computation. To reduce this requirement, we
propose a high-threshold fault-tolerant quantum computation with GKP qubits
using topologically protected measurement-based quantum computation with the
surface code. By harnessing analog information contained in the GKP qubits, we
apply analog quantum error correction to the surface code.Furthermore, we
develop a method to prevent the squeezing level from decreasing during the
construction of the large scale cluster states for the topologically protected
measurement based quantum computation. We numerically show that the required
squeezing level can be relaxed to less than 10 dB, which is within the reach of
the current experimental technology. Hence, this work can considerably
alleviate this experimental requirement and take a step closer to the
realization of large scale quantum computation.Comment: 14 pages, 7 figure
Regioselective Difunctionalization of 2,6-Difluorophenols Triggered by Sigmatropic Dearomatization
Regioselective difunctionalization of 2, 6-difluorophenols with aryl sulfoxides and nucleophiles has been accomplished. The reaction is composed of (1) Pummerer-based [3, 3] sigmatropic dearomatization to generate 2, 4-cyclohexadienone, (2) Michael addition of a nucleophile, and (3) liberation of HF for rearomatization. Besides the [3, 3] rearrangement, [2, 3] sigmatropic rearrangement from sulfonium ylide generated from alkyl sulfoxide promotes the dearomatization, resulting in installation of α-sulfanylalkyl group
Spreading of BAg-5 on Pre-Flux Coated Stainless Steel Plate (Report II) : Function of Fluxes Mixed with CuCl or CoClâ(Welding Physics, Processes & Instruments)
CAPTDURE: Captioned Sound Dataset of Single Sources
In conventional studies on environmental sound separation and synthesis using
captions, datasets consisting of multiple-source sounds with their captions
were used for model training. However, when we collect the captions for
multiple-source sound, it is not easy to collect detailed captions for each
sound source, such as the number of sound occurrences and timbre. Therefore, it
is difficult to extract only the single-source target sound by the
model-training method using a conventional captioned sound dataset. In this
work, we constructed a dataset with captions for a single-source sound named
CAPTDURE, which can be used in various tasks such as environmental sound
separation and synthesis. Our dataset consists of 1,044 sounds and 4,902
captions. We evaluated the performance of environmental sound extraction using
our dataset. The experimental results show that the captions for single-source
sounds are effective in extracting only the single-source target sound from the
mixture sound.Comment: Accepted to INTERSPEECH202
Onoma-to-wave: Environmental sound synthesis from onomatopoeic words
In this paper, we propose a framework for environmental sound synthesis from
onomatopoeic words. As one way of expressing an environmental sound, we can use
an onomatopoeic word, which is a character sequence for phonetically imitating
a sound. An onomatopoeic word is effective for describing diverse sound
features. Therefore, using onomatopoeic words for environmental sound synthesis
will enable us to generate diverse environmental sounds. To generate diverse
sounds, we propose a method based on a sequence-to-sequence framework for
synthesizing environmental sounds from onomatopoeic words. We also propose a
method of environmental sound synthesis using onomatopoeic words and sound
event labels. The use of sound event labels in addition to onomatopoeic words
enables us to capture each sound event's feature depending on the input sound
event label. Our subjective experiments show that our proposed methods achieve
higher diversity and naturalness than conventional methods using sound event
labels
Environmental sound synthesis from vocal imitations and sound event labels
One way of expressing an environmental sound is using vocal imitations, which
involve the process of replicating or mimicking the rhythm and pitch of sounds
by voice. We can effectively express the features of environmental sounds, such
as rhythm and pitch, using vocal imitations, which cannot be expressed by
conventional input information, such as sound event labels, images, or texts,
in an environmental sound synthesis model. In this paper, we propose a
framework for environmental sound synthesis from vocal imitations and sound
event labels based on a framework of a vector quantized encoder and the
Tacotron2 decoder. Using vocal imitations is expected to control the pitch and
rhythm of the synthesized sound, which only sound event labels cannot control.
Our objective and subjective experimental results show that vocal imitations
effectively control the pitch and rhythm of synthesized sounds.Comment: Submitted to ICASSP202
Field-Induced gap due to four-spin exchange in a spin ladder
The effect of the four-spin cyclic exchange interaction at each plaquette in
the two-leg spin ladder is investigated at T=0, especially focusing on
the field-induced gap. The strong rung coupling approximation suggests that it
yields a plateau at half of the saturation moment () in the
magnetization curve, which corresponds to a field-induced spin gap with a
spontaneous breaking of the translational symmetry. A precise phase diagram at
is also presented based on the level spectroscopy analysis of the
numerical data obtained by Lanczos method. The boundary between the gapless and
plateau phases is confirmed to be of the Kosterlitz-Thouless (KT) universality
class.Comment: 10 pages, 3 eps figures (embedded), to be published in J. Phys.:
Cond. Matte
Local structural analyses on molten terbium fluoride in lithium fluoride and lithiumâcalcium fluoride mixtures
X-ray absorption fine structure (XAFS) measurements on terbium fluoride in molten lithium fluoride and in molten
lithiumâcalcium fluoride mixtures, (e.g. 0.20TbF3â0.80LiF, 0.20TbF3â0.62LiFâ0.18CaF2, 0.20TbF3â0.48LiFâ0.32CaF2, 0.50TbF3â0.50LiF, and 0.50TbF3â0.38LiFâ0.12CaF2), have been carried out. In the solid state, coordination number of terbium (Ni) and inter ionic distances between terbium and fluorine in the first neighbor (ri) are nearly constant in all mixtures. In 0.20TbF3â0.80LiF, 0.20TbF3â0.62LiFâ0.18CaF2 and 0.50TbF3â0.50LiF mixtures, Ni's decrease from ca. 8 to 6 and ri's also decrease from ca. 2.29 to 2.26 Ă
on melting. On the other hands, in molten 0.20TbF3â0.48LiFâ0.32CaF2 and 0.50TbF3â0.38LiFâ0.12CaF2 mixtures, Ni's are slightly larger than 6 and ri's do not change. These facts correspond to the amount of Fâ supplied by solvent melts, i.e. the effect of CaF2 becomes predominant at bCaF2 > 0.32 in ternary 0.20TbF3âaLiFâbCaF2 mixtures and at bCaF2 > 0.12 in ternary 0.50TbF3âaLiFâbCaF2 mixtures
Spreading of BAg-5 on Pre-Flux Coated Stainless Steel Plate : Function of Fluxes Mixed with NiClâ or FeClâ
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