Re: Basic path integral

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 7:22:45 PM UTC-5, Lawrence Crowell wrote: > > On Wednesday, October 16, 2019 at 5:50:32 PM UTC-5, Philip Thrift wrote: >> >> >> >> On Wednesday, October 16, 2019 at 5:33:53 PM UTC-5, Lawrence Crowell >> wrote: >>> >>> What is a path integral? It is an

Re: Basic path integral

2019-10-16 Thread Lawrence Crowell
On Wednesday, October 16, 2019 at 5:50:32 PM UTC-5, Philip Thrift wrote: > > > > On Wednesday, October 16, 2019 at 5:33:53 PM UTC-5, Lawrence Crowell wrote: >> >> What is a path integral? It is an accounting of all amplitudes or paths >> from the state |i> to |f> at t = 0 and t = T respectively.

Re: Something deeply hidden in the forest

2019-10-16 Thread Bruce Kellett
On Thu, Oct 17, 2019 at 8:51 AM John Clark wrote: > On Wed, Oct 16, 2019 at 4:49 PM 'Brent Meeker' < > everything-list@googlegroups.com> wrote: > >> * > I thought you read Carroll's book. His example shows in what sense >> you can erase the information after the photon has hit the screen.* >>

Re: Basic path integral

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 5:50:32 PM UTC-5, Philip Thrift wrote: > > > > On Wednesday, October 16, 2019 at 5:33:53 PM UTC-5, Lawrence Crowell wrote: >> >> What is a path integral? It is an accounting of all amplitudes or paths >> from the state |i> to |f> at t = 0 and t = T

Re: Basic path integral

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 5:33:53 PM UTC-5, Lawrence Crowell wrote: > > What is a path integral? It is an accounting of all amplitudes or paths > from the state |i> to |f> at t = 0 and t = T respectively. The amplitude > for this is , and to compute the paths we consider the

Re: Something deeply hidden in the forest

2019-10-16 Thread John Clark
On Wed, Oct 16, 2019 at 6:10 PM 'Brent Meeker' v < everything-list@googlegroups.com> wrote: >> you still haven't told me what your best guess is that Deutsch will find > when he develops that all important photographic plate; will he see > interference bands or no interference bands? I've already

Basic path integral

2019-10-16 Thread Lawrence Crowell
What is a path integral? It is an accounting of all amplitudes or paths from the state |i> to |f> at t = 0 and t = T respectively. The amplitude for this is , and to compute the paths we consider the completeness sums 1 = ∫|q(t)> = which we write in the more compact formatting for the initial

Re: Something deeply hidden in the forest

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 4:47:43 PM UTC-5, Brent wrote: > > > > On 10/16/2019 2:05 PM, Philip Thrift wrote: > > > > On Wednesday, October 16, 2019 at 3:49:12 PM UTC-5, Brent wrote: >> >> >> >> On 10/16/2019 8:22 AM, John Clark wrote: >> >> On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett

Re: Something deeply hidden in the forest

2019-10-16 Thread 'Brent Meeker' via Everything List
On 10/16/2019 2:50 PM, John Clark wrote: On Wed, Oct 16, 2019 at 4:49 PM 'Brent Meeker'  > wrote: /> I thought you read Carroll's book.  His example shows in what sense you can erase the information after the photon has hit the screen./

Re: Something deeply hidden in the forest

2019-10-16 Thread John Clark
On Wed, Oct 16, 2019 at 4:49 PM 'Brent Meeker' < everything-list@googlegroups.com> wrote: > * > I thought you read Carroll's book. His example shows in what sense > you can erase the information after the photon has hit the screen.* > If you wait to erase the which way information until after

Re: Something deeply hidden in the forest

2019-10-16 Thread 'Brent Meeker' via Everything List
On 10/16/2019 2:05 PM, Philip Thrift wrote: On Wednesday, October 16, 2019 at 3:49:12 PM UTC-5, Brent wrote: On 10/16/2019 8:22 AM, John Clark wrote: On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett > wrote: > I/n the delayed choice experiment, the decision whether or

Re: Something deeply hidden in the forest

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 3:49:12 PM UTC-5, Brent wrote: > > > > On 10/16/2019 8:22 AM, John Clark wrote: > > On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett > wrote: > > > I*n the delayed choice experiment, the decision whether or not to >> quantum erase the "which way" information can

Re: Something deeply hidden in the forest

2019-10-16 Thread 'Brent Meeker' via Everything List
On 10/16/2019 8:22 AM, John Clark wrote: On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett > wrote: > I/n the delayed choice experiment, the decision whether or not to quantum erase the "which way" information can be made long after the original photons

Re: Superposition Misinterpreted

2019-10-16 Thread Alan Grayson
On Monday, October 14, 2019 at 3:50:46 PM UTC-6, Alan Grayson wrote > > > On Monday, October 14, 2019 at 10:51:03 AM UTC-6, Brent wrote: >> >> >> On 10/13/2019 9:10 PM, Alan Grayson wrote: >> >> On Sunday, October 13, 2019 at 5:50:35 PM UTC-6, Brent wrote: >>> >>> >>> >>> On 10/13/2019 1:08 PM,

Re: Something deeply hidden in the forest

2019-10-16 Thread 'scerir' via Everything List
"In the delayed choice experiment, the decision whether or not to quantum erase the "which way" information can be made long after the original photons hit the screen and make their marks there. So decoherence has set in, and any parallel universes have necessarily become different in some

Re: Something deeply hidden in the forest

2019-10-16 Thread John Clark
On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett wrote: > I*n the delayed choice experiment, the decision whether or not to quantum > erase the "which way" information can be made long after the original > photons hit the screen and make their marks there.* > No. In the delayed choice experiment

Re: Something deeply hidden in the forest

2019-10-16 Thread spudboy100 via Everything List
My focus (not yours!!!) is ponder the crossing over from universe to universe, which I believe you hold, as impossible. QC universes was Deutsch's spec, on quantum computing and the principle behind it. Good fortune to us all, if we can successfully harness QC. Let is do it to enhance human

Re: Something deeply hidden in the forest

2019-10-16 Thread John Clark
On Tue, Oct 15, 2019 at 7:55 PM 'Brent Meeker' < everything-list@googlegroups.com> wrote: *>>> What about the world in which a K40 atom in JKC's blood stream decayed > compared to one in which it didn't?* > >> What about it? > > * > Does it produce another world?* > Do I really have to spell

Re: Something deeply hidden in the forest

2019-10-16 Thread Philip Thrift
On Wednesday, October 16, 2019 at 7:23:53 AM UTC-5, Bruno Marchal wrote: > > > On 14 Oct 2019, at 20:20, 'Brent Meeker' via Everything List < > everyth...@googlegroups.com > wrote: > > Part of the dislike of the MWI is that its proponents assume a purity that > is not an evident virtue of the

Re: Yes, it's true. Theoretical physics has become a lunatic asylum.

2019-10-16 Thread Bruno Marchal
> On 15 Oct 2019, at 19:37, Philip Thrift wrote: > > > > On Tuesday, October 15, 2019 at 7:46:07 AM UTC-5, Bruno Marchal wrote: > >> But never mind, especially that with Mechanism, there are no world at all, >> just “numbers”, together with + and *. > > Bruno > > > > That's certainly

Re: Yes, it's true. Theoretical physics has become a lunatic asylum.

2019-10-16 Thread Bruno Marchal
> On 15 Oct 2019, at 18:57, 'Brent Meeker' via Everything List > wrote: > > > > On 10/15/2019 5:43 AM, Bruno Marchal wrote: Imagine the WM-duplication, or better here, a guy who is duplicated in two virtual rooms, numerically identical, except for a close virtual envelop

Re: Something deeply hidden in the forest

2019-10-16 Thread Bruno Marchal
> On 16 Oct 2019, at 00:29, Philip Thrift wrote: > > > > On Tuesday, October 15, 2019 at 4:14:39 PM UTC-5, John Clark wrote: > On Tue, Oct 15, 2019 at 1:50 PM 'Brent Meeker' > wrote: > > > Curiously, Deutsch used a quantum computer in a thought experiment to prove > > multiple worlds. >

Re: Something deeply hidden in the forest

2019-10-16 Thread Bruno Marchal
> On 15 Oct 2019, at 00:22, 'Brent Meeker' via Everything List > wrote: > > > > On 10/14/2019 2:50 PM, John Clark wrote: >> On Mon, Oct 14, 2019 at 4:05 PM 'Brent Meeker' >> mailto:everything-list@googlegroups.com>> >> wrote: >> >> >> It's not assumed its concluded based on overwhelming

Re: Something deeply hidden in the forest

2019-10-16 Thread Bruno Marchal
> On 14 Oct 2019, at 20:20, 'Brent Meeker' via Everything List > wrote: > > Part of the dislike of the MWI is that its proponents assume a purity that is > not an evident virtue of the intepretation. For example, interpreting the > squared amplitudes as probabilities seems to be assumed,

know logic / @JDHamkins

2019-10-16 Thread Philip Thrift
slides: http://jdh.hamkins.org/wp-content/uploads/I-know-you-know-I-know-you-know-Oxford-October-2019-1.pdf Wednesday, October 16th, Oxford, England, 5pm http://jdh.hamkins.org/i-know-that-you-know-that-i-know-that-you-know-oxford-october-2019/ *Abstract.* In this talk, we shall pose and

Re: Something deeply hidden in the forest

2019-10-16 Thread Philip Thrift
On Tuesday, October 15, 2019 at 6:16:33 PM UTC-5, Lawrence Crowell wrote: > > On Tuesday, October 15, 2019 at 5:29:21 PM UTC-5, Philip Thrift wrote: >> >> >> >> But the path integral is both interpretation of quantum computing - >> https://arxiv.org/abs/quant-ph/0607151 (2006) - and algorithm