Measurement-free topological protection using dissipative feedback

Protecting quantum information from decoherence due to environmental noise is vital for fault-tolerant quantum computation. To this end, standard quantum error correction employs parallel projective measurements of individual particles, which makes the system extremely complicated. Here we propose measurement-free topological protection in two dimension without any selective addressing of individual particles. We make use of engineered dissipative dynamics and feedback operations to reduce the entropy generated by decoherence in such a way that quantum information is topologically protected. We calculate an error threshold, below which quantum information is protected, without assuming selective addressing, projective measurements, nor instantaneous classical processing. All physical operations are local and translationally invariant, and no parallel projective measurement is required, which implies high scalability. Furthermore, since the engineered dissipative dynamics we utilized has been well studied in quantum simulation, the proposed scheme can be a promising route progressing from quantum simulation to fault-tolerant quantum information processing.Comment: 17pages, 6 figure

ANALISIS TERHADAP PROSTITUSI ONLINE DITINJAU DARI UNDANG-UNDANG NOMOR 11 TAHUN 2008 TENTANG INFORMASI DAN TRANSAKSI ELEKTRONIK (STUDI PUTUSAN PENGADILAN NEGERI SLEMAN NOMOR: 470/Pid.Sus/2014/PN.Smn)

Prambudi Adi Negoro, E0011245. 2015. ANALISIS TERHADAP PROSTITUSI ONLINE DITINJAU DARI UNDANG-UNDANG NOMOR 11 TAHUN 2008 TENTANG INFORMASI DAN TRANSAKSI ELEKTRONIK (Studi Putusan Pengadilan Negeri Sleman Nomor 470 Pid.Sus/2014/PN.Smn). Fakultas Hukum, Universitas Sebelas Maret. Penelitian ini bertujuan untuk mengetahui pengaturan terhadap prostitusi online dalam ketentuan hukum pidana di Indonesia dan bagaimana penerapan Undang-Undang Nomor 11 Tahun 2008 Tentang Informasi Dan Transaksi Elektronik terhadap tindak pidana prostitusi online dalam Putusan Pengadilan Negeri Sleman Nomor: 470 Pid.Sus/2014/PN.Smn. Penelitian ini merupakan penelitian hukum normatif yang bersifat preskriptif dengan pendekatan perundang-undangan, dan pendekatan analisis hukum. Jenis data yang digunakan adalah data sekunder. Sumber data sekunder yang digunakan mencakup bahan hukum primer dan bahan hukum sekunder. Teknik pengumpulan data yang dipergunakan adalah teknik studi kepustakaan. Teknik analisis yang digunakan dalam penelitian ini adalah dengan metode silogisme yang menggunakan pola berpikir deduktif. Hasil penelitian menunjukkan bahwa Undang-Undang Nomor 11 tahun 2008 pasal 27 ayat (1) dapat diterapkan pada pelaku kejahatan prostitusi online, dalam pasal tersebut terdapat unsur melanggar kesusilaan, dimana prostitusi online termasuk didalamnya, sehingga bagi pelaku yang melakukan tindak pidana prostitusi online dapat dipidana berdasarkan pasal 27 ayat (1) jo pasal 45 ayat (1) Undang-Undang Nomor 11 tahun 2008 tentang Informasi dan Transaksi Elektronik. Terkait dengan Putusan Hakim Nomor 470 Pid.Sus/2014/PN.Smn, hakim sudah tepat dalam menerapakan hukum sebagaimana dirumuskan didalam pasal 27 ayat (1) Undang-Undang Nomor 11 Tahun 2008 tentang Informasi dan Transaksi Elektronik. Kata Kunci: Prostitusi Online, Informasi, Transaksi Elektroni

Recurrent Outbursts and Jet Ejections Expected in Swift J1644+57: Limit-Cycle Activities in a Supermassive Black Hole

The tidal disruption event by a supermassive black hole in Swift J1644+57 can trigger limit-cycle oscillations between a supercritically accreting X-ray bright state and a subcritically accreting X-ray dim state. Time evolution of the debris gas around a black hole with mass M=10^{6} {\MO} is studied by performing axisymmetric, two-dimensional radiation hydrodynamic simulations. We assumed the $\alpha$-prescription of viscosity, in which the viscous stress is proportional to the total pressure. The mass supply rate from the outer boundary is assumed to be ${\dot M}_{\rm supply}=100L_{\rm Edd}/c^2$, where $L_{\rm Edd}$ is the Eddington luminosity, and $c$ is the light speed. Since the mass accretion rate decreases inward by outflows driven by radiation pressure, the state transition from a supercritically accreting slim disk state to a subcritically accreting Shakura-Sunyaev disk starts from the inner disk and propagates outward in a timescale of a day. The sudden drop of the X-ray flux observed in Swift J1644+57 in August 2012 can be explained by this transition. As long as ${\dot M}_{\rm supply}$ exceeds the threshold for the existence of a radiation pressure dominant disk, accumulation of the accreting gas in the subcritically accreting region triggers the transition from a gas pressure dominant Shakura-Sunyaev disk to a slim disk. This transition takes place at $t {\sim}~50/({\alpha}/0.1)$ days after the X-ray darkening. We expect that if $\alpha > 0.01$, X-ray emission with luminosity $\gtrsim 10^{44}$ ${\rm erg}{\cdot}{\rm s}^{-1}$ and jet ejection will revive in Swift J1644+57 in 2013--2014.Comment: 6 pages, 4 figures, accepted for publication in PASJ Letter

Kredibilitas Customer Service Dan Citra Perusahaan

: This study aims to analyse the relationship between credibility of customer service and corporate image by using explanatory with quantitative approach as the method. The total number of participants was 100. They are customers who have complaint or critique to the customer service about their service or other issues. It is found that there is a strong correlation between customer service and corporate image (r=0,743 or 74,3%). Sex, age, and education are the factors that determine this correlation