C. Jess Riedel

C. Jess Riedel

Physics of Information Group
IBM Research

E-Mail: jessriedel at gmail dot com

CV | Blog | IBM page | arXiv Papers

Recent work

M. Zwolak, CJR, and W. Zurek, "Amplification, Redundancy, and the Quantum Chernoff Information", to appear in Phys. Rev. Lett.


CJR, "The Standard Quantum Limit Arising from a Preferred Basis".

[pre-preprint PDF]

CJR, "Evidence for Gravitons from Decoherence by Bremsstrahlung".


CJR, "Local Records and Global Entanglement: A Unique Multi-Partite Generalization of the Schmidt Decomposition".


CJR, W. Zurek, and M. Zwolak, "The Objective Past of a Quantum Universe - Part 1: Redundant Records of Consistent Histories".

[arXiv:1312.0331][Slides (Perimeter)]

CJR, "Direct Detection of Classically Undetectable Dark Matter through Quantum Decoherence", Phys. Rev. D 88, 116005 (2013).

[arXiv:1212.3061][Slides (Perimeter)][Video (Perimeter)][FAQs (Blog)]

CJR, "Decoherence and the Quantum Detection of Classically Undetectable Phenomena."

[arXiv:1205.3195][Slides (Waterloo)][Video (Waterloo)]

Charles H. Bennett and CJR, "On the security of key distribution based on Johnson-Nyquist noise."


CJR, Wojciech H. Zurek, and Michael Zwolak, "The Rise and Fall of Redundancy in Decoherence and Quantum Darwinism," New J. Phys. 14, 083010 (2012).

[arXiv:1205.3197][Slides (thesis defense)]

CJR and Wojciech H. Zurek, "Redundant Information from Thermal Illumination: Quantum Darwinism in Scattered Photons," New J. Phys. 13, 073038 (2011).

[arXiv:1102.3179][Slides (Traunkirchen)]

CJR and Wojciech H. Zurek, "Quantum Darwinism in an Everyday Environment: Huge Redundancy in Scattered Photons," Phys. Rev. Lett. 105, 020404 (2010).


(Collaborators: Charles H. Bennett, Michael Zwolak, Wojciech H. Zurek.)

Online Persona

HackerNews, StackExchange (Physics.SE, MathOverflow), 80k Hours, ForeXiv, Google Scholar, arXiv.

Bad ways to think about Quantum Mechanics

Wrong: The Aharonov–Bohm effect says something profound about the "reality" of potentials in quantum mechanics
Right: Non-zero forces on source charges, obscurred by the semi-classical limit, show that potentials are just as real (or ficticious) as they are classically.
Implication: "The core of the Aharonov-Bohm effect is the same as the core of quantum entanglement: the quantum wave function describes all systems together."
More: Lev Vaidman, arXiv:1110.6169.
Implication: The Aharonov–Bohm effect, like entanglement-enabled surpassing of the shot-noise limit, is a special case of a quantum-enhanced measurement.
More: C. Jess Riedel, arXiv:1205.3195.

Wrong: Observables are "represented" (?) by Hermitian operators.
Right: Measurements necessarily amplify, and therefore (!) are associated with an orthogonal basis. This is the Schmidt basis of the entangled joint state of the measuring apparatus and the measured system.
More: Wojciech H. Zurek, Phys. Rev. A 76, 052110 (2007), [arXiv:quant-ph/0703160]. Also: [arXiv:1212.3245].
Implication: Observables can be associated with normal, not just Hermitian, operators.


♦ See LaTeX in your Gmail and GChat: GmailTeX (real-time, browser plug-in required).
♦ Instant Markdown and LaTeXing in browser: Socrates (hyperlink-shareable, no plugin required).
♦ Produce LaTeX images online: Roger's Online Equation Editor.
♦ PDF Cropping in Windows: Briss.
♦ Find the LaTeX name of a symbol by drawing it: Detexify.
♦ LaTeXing in Windows: TeXnicCenter with MikTeX.
♦ Exports citations directly to BibTex from Google Scholar: Google Scholar Settings.
♦ My LaTeX header file (bra-ket notation, etc.): riedelheader.tex.
♦ Free LaTeX templates: LaTeX Templates/.


Fast partial trace of multi-qubit density matrix: [Mathematica Notebook] [Plain ASCII].

Fast, formula-based computation of Gaussian integrals: [Mathematica Notebook].


Alternatives for common applications: alternativeTo.

Multiple app installers: ninite.

Windows software and services I use: Notepad++, Dropbox, Gmail Offline, Google Calendar Offline, Evernote, Insomnia, GIMP, 7-zip, IrfanView, WinDirStat, Mathematica, WinSCP, Zotero with ZotFile, FoxIt PDF Reader, Wordpress.


(Quicktime .mov files allows one to pan and zoom)

Cabezon peak, NM, just before solar eclipse (2012-5-20):
[MOV (large)] [MOV (med)] [MOV (small)] [JPEG].

Inside the adventure bus (2012-7-22):
[MOV (large)] [MOV (med)] [MOV (small)] [JPEG].

Former institutions

Los Alamos National Lab: CNLS & T-4 (2009-2012)
UC Santa Barbara Physics (2007-2012)
Princeton Physics (2003-2007)
Thomas Jefferson HSST (1999-2003)

Mailing address

Office: Room 37-130, Main Building (801)
Address: IBM Watson Research Center
1101 Kitchawan Road
Yorktown Heights, NY 10598