Violation of Bell's Inequality under Strict Einstein Locality Conditions

Data reuse

Please cite G. Weihs et al., Phys. Rev. Lett. 81, 5039 (1998) in publications that reuse this data and if possible inform the lead author, who is always keen to learn what else one can do with the data.

Data description

The data contained in the two archives Alice.zip and Bob.zip and were collected in the years 1997 through 1999 as a long-distance test of Bell's inequality and quantum key distribution. Publications that are based on this data include G. Weihs et al., Phys. Rev. Lett. 81, 5039 (1998) and T. Jennewein et al. Phys. Rev. Lett. 85, 4729 (2000). The former is cited in the 2022 Nobel Prize announcement.

Data format

All files come in triplets for each observer (Alice, blue, west end of Innsbruck campus; Bob, red, east end of campus). Everything has been packed into an archive for each observer (alice.zip, bob.zip).

*_H.txt

Cryptic laboratory comments containing information about some unimportant(?) experimental parameters.

*_V.dat

Photon arrival times where the "arm" time has already been subtracted. IEEE-8bit double precision numbers in "Big Endian"-form naturally sorted ascendingly. Actual time resolution is 10-10seconds, but accuracy is only 0.5 ns.

*_C.dat

Apparatus setting and "outcome" for each photon detection encoded in the following way: 16-bit integers in "Big Endian"-form, each number showing the detector (0=vertical, 1=horizontal with repect to the polarizer) that fired in its LSB and the position of the switch (0=no rotation, 1=45° rotation) in the next to LSB. (Not very efficient, but quicker when sampling directly to the PCs RAM during data acquisition!)

Somebody said that the bits must be reversed. I don't think so but there is always a chance that I made double, compensating mistakes in my LabView and C programming.

Files and folders

Folder Name
Description
Mode
Start Date

bellstat
Static BI test (no fast switching)
local, static
30-Nov-1997

bluesine
Static correlation scan varying "blue" modulator bias
local
30-Nov-1997

first

local
28-Nov-1997

firstlong
First run of long-distance (360m separation) measurements
remote
28-Apr-1998

korrel

localswitch

local, switched (45°)
11-Jan-1998

locbell
BI Test
local, swiched (45°)
26-Mar-1998

loccorr
Measurement of correlations in parallel bases
local , switched (45°)
30-Mar-1998

longdist
Main run of long-distance BI tests
remote, switched (45°)
15-Apr-1998

longtime
Maximum continous measurement time (about 5 minutes!) BI test
remote, switched (45°)
06-Jun-1998

newlongtime

remote, switched (45°)
22-Dec-1998

scanblue
Scan varying "blue" side modulator bias
remote, switched (45°)
01-May-1998

scanred
Scan varying "red" side modulator bias
remote, switched (45°)
31-May-1998

sineblue
Scan varying "blue" side modulator bias
local, switched (45°)
01-Apr-1998

sinered
Scan varying "red" side modulator bias
local, switched (45°)
30-Mar-1998

switchtest

local, switched (45°)
03-Jan-1998

wignerscanalice
Scan varying "blue"side modulator bias, basis choice for Wigner's inequality
remote, switched (30°)
23-Dec-1998