Talks

10525 - 10536 of 16890 Results

Quantum key expansion based on entanglement-assisted quantum LDPC codes

Todd Brun University of Southern California

April 03, 2013

PIRSA:13040108

Quantum Information
Black holes as probes of fundamental physics

Vitor Cardoso Instituto Superior Tecnico - Departamento de Física

April 03, 2013

PIRSA:13040109

Particle Physics

Cosmology
12/13 PSI - Explorations in Particle Theory Lecture 12

David Morrissey TRIUMF

April 03, 2013

PIRSA:13040040

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 12

David Cory Institute for Quantum Computing (IQC)

April 03, 2013

PIRSA:13040035

Quantum Information
Advanced General Relativity - Lecture 21

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040001
Three-point functions: SFT, integrability, and perturbative calculations.

April 02, 2013

PIRSA:13040110

Quantum Fields and Strings
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040115

Particle Physics
12/13 PSI - Explorations in Particle Theory Lecture 11

David Morrissey TRIUMF

April 02, 2013

PIRSA:13040039

Particle Physics
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources

Edo Berger Harvard University

April 02, 2013

PIRSA:13040081

Cosmology

Strong Gravity
12/13 PSI - Explorations on Quantum Information Lecture 11

David Cory Institute for Quantum Computing (IQC)

April 02, 2013

PIRSA:13040034

Quantum Information
12/13 PSI - Explorations in Particle Theory Lecture 10

David Morrissey TRIUMF

April 01, 2013

PIRSA:13040038

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 10

David Cory Institute for Quantum Computing (IQC)

April 01, 2013

PIRSA:13040033

Quantum Information

Quantum key expansion based on entanglement-assisted quantum LDPC codes

Todd Brun University of Southern California

April 03, 2013

PIRSA:13040108

Quantum Information

Quantum key distribution protocols can be based on quantum error correcting codes, where the structure of the code determines the post processing protocol applied to a raw key produced by BB84 or a similar scheme. Luo and Devetak showed that basing a similar protocol on entanglement-assisted quantum error-correcting codes (EAQECCs) leads to quantum key expansion (QKE) protocols, where some amount of previously shared secret key is used as a seed in the post-processing stage to produce a larger secret key. One of the promising aspects of EAQECCs is that they can be constructed from classical linear codes that don't satisfy the dual-containing property, which among other things allows the use of low density parity-check (LDPC) codes with girth greater than 4, for which the iterative decoding algorithm has better performance. We looked into QKE based on a family of EAQECCs generated by classical finite geometry (FG) LDPC codes. Very efficient iterative decoders exist for these codes, and they were shown by Hsieh, Yen and Hau to produce quantum LDPC codes that require very little entanglement. We modify the original QKE protocol to detect bad code blocks without the consumption of secret key when the protocol fails. This allows us to greatly reduce the bit error rate of the key, at the cost of a minor reduction in the net key production rate, but without increasing the consumption rate of pre-shared key. Numerical simulations for the family of FG LDPC codes show that this improved QKE protocol has a good net key production rate even at relatively high error rates, for appropriate code choices.
Black holes as probes of fundamental physics

Vitor Cardoso Instituto Superior Tecnico - Departamento de Física

April 03, 2013

PIRSA:13040109

Particle Physics

Cosmology

Black holes are the elementary particles of gravity, the final state of sufficiently massive stars and of energetic collisions. With a forty-year long history, black hole physics is a fully-blossomed field which promises to embrace several branches of theoretical physics. Here I review the main developments in highly dynamical black holes with an emphasis on high energy black hole collisions and probes of particle physics via superradiance.
12/13 PSI - Explorations in Particle Theory Lecture 12

David Morrissey TRIUMF

April 03, 2013

PIRSA:13040040

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 12

David Cory Institute for Quantum Computing (IQC)

April 03, 2013

PIRSA:13040035

Quantum Information
Advanced General Relativity - Lecture 21

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040001
Three-point functions: SFT, integrability, and perturbative calculations.

April 02, 2013

PIRSA:13040110

Quantum Fields and Strings

I discuss several recent efforts in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS correlation functions to direct perturbative calculations and integrability-assisted methods. I review the next-to-leading order agreement between strings and perturbation theory in the SO(6) sector, a conjectured extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the leading order; finally, I discuss the issue of equating exactly extremal and non-extremal correlators at NLO in the integrability-assisted calculation.
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute for Theoretical Physics

April 02, 2013

PIRSA:13040115

Particle Physics

Physics is at a crossroad that leads either to Naturalness or the Multiverse. While the confirmation of gauge coupling unification in the early 90s gave a tremendous boost to naturalness and to low energy SUSY, the lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present at all, is realized at higher energies. This points to Split SUSY, a framework motivated by the String Landscape. Fine-tuning electroweak symmetry breaking and the renormalization group evolution of the scalar masses constrains Split model building and I review the expectations at the LHC for the different possible Split SUSY particle spectra.
12/13 PSI - Explorations in Particle Theory Lecture 11

David Morrissey TRIUMF

April 02, 2013

PIRSA:13040039

Particle Physics
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources

Edo Berger Harvard University

April 02, 2013

PIRSA:13040081

Cosmology

Strong Gravity

The bimodality of gamma-ray burst (GRB) durations points to distinct progenitor classes for the long- and short-duration GRBs. While the progenitors of long-duration GRBs are now known to be massive stars, the progenitors of short-duration GRBs remain unidentified. In this talk I will discuss the discovery of short GRB afterglow and their host galaxies, detailed studies of their environments from parsec to galactic scales, and studies of their energetics and beaming. Taken together, these observations point to the coalescence of NS-NS/NS-BH binaries as the most likely progenitors. With the upcoming Advanced LIGO/VIRGO gravitational wave detectors it is therefore possible that short GRBs will be the first detected sources, and I will discuss various approaches to making this connection between gravitational wave and electromagnetic sources.
12/13 PSI - Explorations on Quantum Information Lecture 11

David Cory Institute for Quantum Computing (IQC)

April 02, 2013

PIRSA:13040034

Quantum Information
12/13 PSI - Explorations in Particle Theory Lecture 10

David Morrissey TRIUMF

April 01, 2013

PIRSA:13040038

Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 10

David Cory Institute for Quantum Computing (IQC)

April 01, 2013

PIRSA:13040033

Quantum Information

Title	Date	Collection	Type	Info
Quantum key expansion based on entanglement-assisted quantum LDPC codes	2013‑04‑03	Quantum Information	Scientific Series	View details
Black holes as probes of fundamental physics	2013‑04‑03	Colloquium	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 12	2013‑04‑03	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 12	2013‑04‑03	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 21	2013‑04‑02	Elements of General Relativity	Course	View details
Three-point functions: SFT, integrability, and perturbative calculations.	2013‑04‑02	Quantum Fields and Strings	Scientific Series	View details
To Split or Not to Split	2013‑04‑02	Particle Physics	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 11	2013‑04‑02	12/13 PSI - Explorations in Particle Theory	Course	View details
Shake, Rattle and Explode: Short GRBs and the Electromagnetic Counterparts of Gravitational Wave Sources	2013‑04‑02	Strong Gravity	Scientific Series	View details
12/13 PSI - Explorations on Quantum Information Lecture 11	2013‑04‑02	12/13 PSI - Explorations on Quantum Information	Course	View details
12/13 PSI - Explorations in Particle Theory Lecture 10	2013‑04‑01	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 10	2013‑04‑01	12/13 PSI - Explorations on Quantum Information	Course	View details

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