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Fault Tolerance via Mixed-State Phases

Amirreza Negari Perimeter Institute for Theoretical Physics
February 03, 2025

PIRSA:25020056
Other
Applications and prospects of Lorentzian path integrals in quantum gravity

Johanna Borissova Perimeter Institute
February 03, 2025

PIRSA:25020037
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 31, 2025

PIRSA:25010064
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 30, 2025

PIRSA:25010063
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 28, 2025

PIRSA:25010062
Other
Scholarly Writing: Insights, Challenges, and Best Practices – A Panel Discussion for Students and Postdocs
- Ben Webster University of Waterloo
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Matthew Johnson York University
January 27, 2025

PIRSA:25010080
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 24, 2025

PIRSA:25010061
Other
Lecture - Beautiful Papers

Pedro Vieira Perimeter Institute for Theoretical Physics
January 24, 2025

PIRSA:25010051
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 23, 2025

PIRSA:25010060
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 21, 2025

PIRSA:25010059
Other
Lecture - Beautiful Papers

Pedro Vieira Perimeter Institute for Theoretical Physics
January 20, 2025

PIRSA:25010050
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 17, 2025

PIRSA:25010058
Other

Fault Tolerance via Mixed-State Phases

Amirreza Negari Perimeter Institute for Theoretical Physics
February 03, 2025

PIRSA:25020056
Other
In this talk, I will explain the concept of fault tolerance, which ensures reliable quantum computation. Building on recent advancements in mixed-state phases of matter, I introduce a new diagnostic called the spacetime Markov length. The divergence of this length scale signals the intrinsic breakdown of fault tolerance.
Applications and prospects of Lorentzian path integrals in quantum gravity

Johanna Borissova Perimeter Institute
February 03, 2025

PIRSA:25020037
Other
Lorentzian path integrals exhibit profoundly different properties from Euclidean ones due to the oscillatory integrand which weighs different configurations through interference. Key troubles encountered in Euclidean quantum gravity are the conformal factor problem of Euclidean quantum GR and divergences due to spike configurations in Euclidean quantum Regge calculus. The first part of this talk will focus on how these troubles are resolved in Lorentzian quantum Regge calculus. I will emphasize the unambiguous choice of contour for the integral over the conformal mode in a saddle-point expansion and furthermore show that bulk-length expectation values are finite for spike and spine configurations away from the classical regime. The second part of this talk will focus on properties of Lorentzian path integrals beyond GR. I will illustrate that higher-derivative and non-local actions can be expected to suppress spacetime configurations with curvature singularities. Finally, I will revisit the long-standing question of global symmetries in quantum gravity by providing examples for non-local actions designed to suppress global-symmetry-violating black-hole configurations in the Lorentzian path integral.
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 31, 2025

PIRSA:25010064
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 30, 2025

PIRSA:25010063
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 28, 2025

PIRSA:25010062
Other
Scholarly Writing: Insights, Challenges, and Best Practices – A Panel Discussion for Students and Postdocs
- Ben Webster University of Waterloo
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Matthew Johnson York University
January 27, 2025

PIRSA:25010080
Other
In the panel discussion, each panelist will showcase examples of well-written papers and share one essential "do" and one important "don't" for crafting effective scientific papers. The session will include an open Q&A segment to encourage audience engagement.
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 24, 2025

PIRSA:25010061
Other
Lecture - Beautiful Papers

Pedro Vieira Perimeter Institute for Theoretical Physics
January 24, 2025

PIRSA:25010051
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 23, 2025

PIRSA:25010060
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 21, 2025

PIRSA:25010059
Other
Lecture - Beautiful Papers

Pedro Vieira Perimeter Institute for Theoretical Physics
January 20, 2025

PIRSA:25010050
Other
Lecture - Numerical Methods, PHYS 777
- Erik Schnetter Perimeter Institute for Theoretical Physics
- Dustin Lang Perimeter Institute for Theoretical Physics
January 17, 2025

PIRSA:25010058
Other

Title	Speaker(s)	Date	Talk Type	Info link
Fault Tolerance via Mixed-State Phases	Amirreza Negari	2025-02-03	Scientific Series	View details
Applications and prospects of Lorentzian path integrals in quantum gravity	Johanna Borissova	2025-02-03	Scientific Series	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-31	Course	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-30	Course	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-28	Course	View details
Scholarly Writing: Insights, Challenges, and Best Practices – A Panel Discussion for Students and Postdocs	Ben Webster, Bianca Dittrich, Matthew Johnson	2025-01-27	Scientific Series	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-24	Course	View details
Lecture - Beautiful Papers	Pedro Vieira	2025-01-24	Course	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-23	Course	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-21	Course	View details
Lecture - Beautiful Papers	Pedro Vieira	2025-01-20	Course	View details
Lecture - Numerical Methods, PHYS 777	Erik Schnetter, Dustin Lang	2025-01-17	Course	View details

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