John Sidles

199 reputation

bio	website	faculty.washington.edu/sidles/…
	location	Seattle, WA
	age	61
visits	member for	8 months
	seen	Nov 17 '12 at 18:50
stats	profile views	83

I am a medical researcher and quantum systems engineer, whose experimental research interests focus upon quantum spin metrology, and whose theoretical interests focus upon large-scale quantum simulation, in service of applications in regenerative medicine.

For in-progress research relating to the Günther Laukien Prize for 2011, see the web page associated to our 52nd ENC poster Quantum Spin Microscopy's Emerging Methods, Roadmaps, and Enterprises.

For further information, see the (open-source) PNAS article "Spin Microscopy's Heritage, Achievements, and Prospects", and see also my MathOverflow answer to the topic "A Book You Would Like to Write" ... most of my questions and answers are conditioned upon these (mainly medical) interests.

	199 reputation	bio	website	faculty.washington.edu/sidles/…	visits	member for	8 months
6 badges		location	Seattle, WA		seen	Nov 17 '12 at 18:50

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Sep 24	awarded	Commentator
Sep 24	comment	How did QED diverge from quantum mechanics mathematically? The dynamical flow associated to the classical Bloch equations is Hamiltonian ... and yet there is no geometrically natural Lagrangian state-space potential (that is, no global singularity-free Lagrangian) associated to classical Bloch flows. Why should quantum Hamiltonian flows be any different? That is why spin degrees of freedom appear in path-integral formulations of quantum field theory in, as Feynman says in his 1948 article, "a purely formal way"--nowadays expressed in terms of Grassmanian variables--that, in Feynman's phrasing, "adds nothing to the understanding of these equations."
Sep 20	comment	A good example of a nonlinear symplectomorphism? The Bloch equations, viewed as a Hamiltonian flow on $S^2$. The symplectomorphism is rotation of the Bloch sphere.
Sep 16	revised	Reversing gravitational decoherence Reference to Lee and Blau
Sep 11	revised	Reversing gravitational decoherence Link to TCS StackExchange question "Physical realization of nonlinear operators for quantum computers"
Sep 9	revised	An example of non-Hamiltonian systems Proof that the dynamics of the Chaplygin sleigh are non-Hamiltonian.
Sep 5	answered	If I go to the church of the greater Hilbert space, can I have Unitary Collapse?
Sep 4	revised	Reversing gravitational decoherence Heat capacity amended from "extensive" to "intensize' Doh!
Aug 31	awarded	Announcer
Aug 31	answered	Tensor product decomposition of SU(2)
Aug 31	revised	Reversing gravitational decoherence Further pedagogic expansion, associated to the Godel's Lost Letter Kalai/Harrow debate
Aug 31	revised	Reversing gravitational decoherence substantial prose smoothing, preparatory to concluding the Harrow/Kalai debate
Aug 31	revised	Reversing gravitational decoherence smoother prose, preparing for future reference in the Gil Kalia/Aram Harrow debate
Aug 31	revised	Reversing gravitational decoherence smoother prose, preparing for future reference in the Gil Kalia/Aram Harrow debate
Aug 31	revised	Reversing gravitational decoherence smoother prose, preparing for future reference in the Gil Kalia/Aram Harrow debate
Aug 30	revised	Reversing gravitational decoherence tuned-up discussion of the partition function
Aug 30	revised	Reversing gravitational decoherence Description of the proper accounting of observation dynamics
Aug 30	revised	Reversing gravitational decoherence Clarification of quantum feedback in Onsager's theory, and link to Godel's Lost Letter
Aug 30	revised	Reversing gravitational decoherence Link to Godel's Lost Letter
Aug 30	comment	Reversing gravitational decoherence @John Preskill , with a view toward clarifying the various subtleties and imprecisions associated to notions like "dressed particles" and "mirrors", the literature survey below has been augmented to show how modern ideas from quantum information theory serve to naturalize and universalize the 20th century understanding of global conservation and local transport processes that is due to Dirac, Onsager, Casimir, Callen, Landau, Green, Kubo, etc. Even today, there is plenty that we do not understand about "dressed particles" and "mirrors."