Conference

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A New Protocol for Loss-Tolerant Quantum Coin Tossing
June 01, 2007

PIRSA:07060005
Quantum Physics
Degradability of Bosonic Gaussian Channels

Filippo Caruso Scuola Normale Superiore di Pisa
June 01, 2007

PIRSA:07060004
Quantum Physics
Subsystem Quantum Error Correcting Codes

Andrea Casaccino University of Siena
June 01, 2007

PIRSA:07060029
Quantum Physics
Single Photon Source on a Breadboard

Erwann Bocquillon Institute for Quantum Computing (IQC)
June 01, 2007

PIRSA:07060002
Quantum Physics
On Connections between machine learning and quantum information processing

Sebastien Gambs Institute for Quantum Computing (IQC)
June 01, 2007

PIRSA:07060001
Quantum Physics
Concluding Remarks

Laurence Yaffe University of Washington
May 25, 2007

PIRSA:07050082
High Energy Physics
Gluon Vortex and Induced Magnetic Fields in Colour Superconductors

Efrain Ferrer Western Illinois University
May 25, 2007

PIRSA:07050081
High Energy Physics
Soft Modes Associated with QCD Phase Transitions From Meson Condensation to Colour Superconductitivity

Teiji Kunihiro Yukawa Institute for Theoretical Physics
May 25, 2007

PIRSA:07050080
High Energy Physics
Early Time Dynamics in Heavy Ion Collisions and AdS/CFT Correspondence

Yuri Kovchegov Ohio State University
May 25, 2007

PIRSA:07050079
High Energy Physics
A Puzzle from Dragging Strings

Christopher Herzog King's College London
May 25, 2007

PIRSA:07050078
High Energy Physics
Bottom-up Approach to AdS / QCD

Misha Stephanov University of Illinois at Chicago
May 25, 2007

PIRSA:07050077
High Energy Physics
Topical Currents in Dense Matter. Applications: From RHIC Physics to Cosmology
May 25, 2007

PIRSA:07050076
High Energy Physics

A New Protocol for Loss-Tolerant Quantum Coin Tossing
June 01, 2007

PIRSA:07060005
Quantum Physics
Quantum coin tossing is a cryptographic task in which two parties, Alice and Bob, wish to generate a shared random bit but do not necessarily trust each other. This task is completely impossible to realize with classical asynchronous communication but becomes at least partially feasible when quantum communication is also available. The best quantum protocol known so far, due to Ambainis, uses qutrits and is near optimal in the sense that either party can bias the outcome with at most a 75% probability of success. However, when the transmission of the link is below 50%, Ambainis' protocol can be easily broken by a cheating Bob. This problem arises whenever there exists a conclusive measurement allowing Bob to obtain with certainty, although with a probability less than one, relevant information about the state sent by Alice. In this talk, we will present a new protocol for quantum coin tossing that does not suffer from this weakness and, as a consequence, is loss-tolerant. We discuss possible attacks and argue that the protocol is secure. Technologically, the implementation of this protocol is no more difficult than implementing entangled quantum key distribution with qubits. This is joint work with Guido Berlin, Gilles Brassard and Nicolas Godbout.
Degradability of Bosonic Gaussian Channels

Filippo Caruso Scuola Normale Superiore di Pisa
June 01, 2007

PIRSA:07060004
Quantum Physics
The notion of weak-degradability of quantum channels is introduced by generalizing the degradability definition given by Devetak and Shor. Exploiting the unitary equivalence with beam-splitter/amplifier channels we then prove that a large class of one-mode Bosonic Gaussian channels are either weakly degradable or anti-degradable. In the latter case this implies that their quantum capacity Q is null. In the former case instead, this allows us to establish the additivity of the coherent information for those maps which admit unitary representation with single-mode pure environment.
Subsystem Quantum Error Correcting Codes

Andrea Casaccino University of Siena
June 01, 2007

PIRSA:07060029
Quantum Physics
The essential insight of quantum error correction was that quantum information can be protected by suitably encoding this quantum information across multiple independently erred quantum systems. Recently it was realized that, since the most general method for encoding quantum information is to encode it into a subsystem, there exists a novel form of quantum error correction beyond the traditional quantum error correcting subspace codes. These new quantum error correcting subsystem codes differ from subspace codes in that their quantum correcting routines can be considerably simpler than related subspace codes. Here we present a class of quantum error correcting subsystem codes constructed from two classical linear codes. These codes are the subsystem versions of the quantum error correcting subspace codes which are generalizations of Shor’s original quantum error correcting subspace codes. For every Shor-type code, the codes we present give a considerable savings in the number of stabilizer measurements needed in their error recovery routines.
Single Photon Source on a Breadboard

Erwann Bocquillon Institute for Quantum Computing (IQC)
June 01, 2007

PIRSA:07060002
Quantum Physics
In quantum information, one can prove that a secure quantum cryptography channel based on photon key distribution requires reliable single photon sources. If not, a potential eavesdropper may be able to get information using the extra photons. Current sources are based on either attenuated laser beams, which may produce randomly 2 or even more photons at a time following a poissonian statistics, or either based on two level-systems providing single photon sources often requiring cooling or complex set-ups.The goal of our experiment is to provide an easy, robust and compact single photon source using nonlinear optics (parametric down-conversion). We want to study its statistics and compare it to other photon sources. We could use this heralded single photon source to create a quantum communication channel.
On Connections between machine learning and quantum information processing

Sebastien Gambs Institute for Quantum Computing (IQC)
June 01, 2007

PIRSA:07060001
Quantum Physics
Concluding Remarks

Laurence Yaffe University of Washington
May 25, 2007

PIRSA:07050082
High Energy Physics
Gluon Vortex and Induced Magnetic Fields in Colour Superconductors

Efrain Ferrer Western Illinois University
May 25, 2007

PIRSA:07050081
High Energy Physics
Soft Modes Associated with QCD Phase Transitions From Meson Condensation to Colour Superconductitivity

Teiji Kunihiro Yukawa Institute for Theoretical Physics
May 25, 2007

PIRSA:07050080
High Energy Physics
Early Time Dynamics in Heavy Ion Collisions and AdS/CFT Correspondence

Yuri Kovchegov Ohio State University
May 25, 2007

PIRSA:07050079
High Energy Physics
A Puzzle from Dragging Strings

Christopher Herzog King's College London
May 25, 2007

PIRSA:07050078
High Energy Physics
Bottom-up Approach to AdS / QCD

Misha Stephanov University of Illinois at Chicago
May 25, 2007

PIRSA:07050077
High Energy Physics
Topical Currents in Dense Matter. Applications: From RHIC Physics to Cosmology
May 25, 2007

PIRSA:07050076
High Energy Physics

Title	Speaker(s)	Date	Talk Type	Info link
A New Protocol for Loss-Tolerant Quantum Coin Tossing		2007-06-01	Conference	View details
Degradability of Bosonic Gaussian Channels	Filippo Caruso	2007-06-01	Conference	View details
Subsystem Quantum Error Correcting Codes	Andrea Casaccino	2007-06-01	Conference	View details
Single Photon Source on a Breadboard	Erwann Bocquillon	2007-06-01	Conference	View details
On Connections between machine learning and quantum information processing	Sebastien Gambs	2007-06-01	Conference	View details
Concluding Remarks	Laurence Yaffe	2007-05-25	Conference	View details
Gluon Vortex and Induced Magnetic Fields in Colour Superconductors	Efrain Ferrer	2007-05-25	Conference	View details
Soft Modes Associated with QCD Phase Transitions From Meson Condensation to Colour Superconductitivity	Teiji Kunihiro	2007-05-25	Conference	View details
Early Time Dynamics in Heavy Ion Collisions and AdS/CFT Correspondence	Yuri Kovchegov	2007-05-25	Conference	View details
A Puzzle from Dragging Strings	Christopher Herzog	2007-05-25	Conference	View details
Bottom-up Approach to AdS / QCD	Misha Stephanov	2007-05-25	Conference	View details
Topical Currents in Dense Matter. Applications: From RHIC Physics to Cosmology		2007-05-25	Conference	View details

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Format results

A New Protocol for Loss-Tolerant Quantum Coin Tossing

Degradability of Bosonic Gaussian Channels

Subsystem Quantum Error Correcting Codes

Single Photon Source on a Breadboard

On Connections between machine learning and quantum information processing

Concluding Remarks

Gluon Vortex and Induced Magnetic Fields in Colour Superconductors

Soft Modes Associated with QCD Phase Transitions From Meson Condensation to Colour Superconductitivity

Early Time Dynamics in Heavy Ion Collisions and AdS/CFT Correspondence

A Puzzle from Dragging Strings

Bottom-up Approach to AdS / QCD

Topical Currents in Dense Matter. Applications: From RHIC Physics to Cosmology

A New Protocol for Loss-Tolerant Quantum Coin Tossing

Degradability of Bosonic Gaussian Channels

Subsystem Quantum Error Correcting Codes

Single Photon Source on a Breadboard

On Connections between machine learning and quantum information processing

Concluding Remarks

Gluon Vortex and Induced Magnetic Fields in Colour Superconductors

Soft Modes Associated with QCD Phase Transitions From Meson Condensation to Colour Superconductitivity

Early Time Dynamics in Heavy Ion Collisions and AdS/CFT Correspondence

A Puzzle from Dragging Strings

Bottom-up Approach to AdS / QCD

Topical Currents in Dense Matter. Applications: From RHIC Physics to Cosmology