GHZ state - 2024 ARGOS - Buzzpoints App

Question

This state is defined as the sum of the 000 ket and the 111 ket divided by the square root of 2. For 10 points each:

[10h] Name this three-qubit non-biseparable state often cited as an example of a maximally entangled state. Unlike the W state, it can be collapsed to a separable state after the measurement of one of its qubits.

ANSWER: GHZ state [or Greenberger-Horne-Zeilinger state]

[10m] Performing this mathematical operation on a subsystem of GHZ state transforms it into a separable, mixed state. The negative of this operation on a density matrix times its logarithm yields its von Neumann entropy.

ANSWER: trace [accept partial trace]

[10e] Anton Zeilinger, the “Z” in GHZ, received the 2022 Nobel Prize in Physics for observations of the GHZ state and its relation to this theorem about the incompatibility of local hidden variable theories with quantum mechanics.

ANSWER: Bell’s theorem [or Bell’s inequality]

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Summary


2024 ARGOS @ Brandeis	03/22/2025	Y	2	10.00	50%	50%	0%
2024 ARGOS @ Chicago	11/23/2024	Y	6	16.67	100%	67%	0%
2024 ARGOS @ Christ's College	12/14/2024	Y	2	15.00	100%	50%	0%
2024 ARGOS @ Columbia	11/23/2024	Y	1	10.00	100%	0%	0%
2024 ARGOS @ McMaster	11/17/2024	Y	5	18.00	100%	80%	0%
2024 ARGOS @ Stanford	02/22/2025	Y	3	16.67	100%	67%	0%
2024 ARGOS Online	03/22/2025	Y	2	20.00	100%	50%	50%

Data


"Powers a question on Stancyzk" that's a clown question bro	Import Pandas	0	0	0	0
\|madam\|	Banned from ARGOS	0	10	10	20
BHSU ReFantazio	Music to Help You Stop Smoking	0	10	10	20
Northeast by Northwestern	Clown Senpais	0	0	10	10
That Feeling When Knee Surgery Is in Five Days	Clown Squad	0	0	10	10
The Love Song of J Alfred PrufRock and Roll All Nite (and Party Every Day)	Notre Dame	0	10	10	20
WashU	hawk two of	0	10	10	20
Who is the Colleen Hoover of the Zulus?	BHSU Rebirth	0	10	10	20
Cambridge	Cien Años de Quizboledad	0	10	10	20
Limp Franceskit	Defying Suavity	0	0	10	10
Cope is the thing with feathers	Walston et. al.	0	0	10	10
She Dicer On My Argonaute Till I RNA Interfere	Moderator Can't Neg me While in Alpha	0	0	10	10
You cannot go to Aarhus to see his peat-brown head / With eyes like ripening fruit	Simpson Agonistes: The Crisis of Donut	0	10	10	20
Communism is Soviet power plus the yassification of the whole country	The Only Existing Manuscript from A Clockwork Orange	0	10	10	20
as rational as the square root of two power bottoms	I'd prefer to have the team name be Christensen et al. than anything that Erik cooks up	0	10	10	20
Tensei Shitara Flashcard Data Ken	Ryan Wesley Routh's 10 000 NATO-trained Afghan Quizbowlers	0	10	10	20
Where are the ACF Nationals recordings?	A is for Amy Robsart who fell down the stairs	0	10	10	20
Berkeley	number of tang poems = 75 times number of lines in a shi = 100 times number of lines in a haiku	0	0	10	10
Cry of the Common Loon	Stanford+	0	10	10	20
CLEVELAND, THIS IS FOR YOU!	Thompson et al.	10	10	10	30
throw away your cards, rally in the streets	I wish it were possible to freeze time so I would never have to watch you retire	0	0	10	10