Quantum Architectures: qasm2circ

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Quantum circuit viewer: qasm2circ

QASM is a simple text-format language for describing acyclic quantum circuits composed from single qubit, multiply controlled single-qubit gates, multiple-qubit, and multiple-qubit controlled multiple-qubit gates.

qasm2circ is a package which converts a QASM file into a graphical depiction of the quantum circuit, using standard quantum gate symbols (and other user-defined symbols). This is done using latex (specifically, xypic), to produce high-quality output in epsf, pdf, or png formats.

Figures of quantum circuits in the book "Quantum Computation and Quantum Information," by Nielsen and Chuang, were produced using an earlier version of this package.

Download distribution here (zip) or (tgz) (the distribution includes all the examples).

Current version = 1.4 (Released 14-Mar-05)

Live demo (MIT only)

Example 1

[ test1.qasm |test1.png |test1.pdf |test1.eps |test1.tex ]

# 
# File:   test1.qasm
# Date:   22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - EPR creation
#
        qubit 	q0
        qubit 	q1

	h	q0	# create EPR pair
	cnot	q0,q1

Example 2

[ test2.qasm |test2.png |test2.pdf |test2.eps |test2.tex ]

# 
# File:   test2.qasm
# Date:   29-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - simple teleportation circuit
#
        qubit 	q0
        qubit 	q1
	qubit 	q2

	h	q1	# create EPR pair
	cnot	q1,q2
	cnot	q0,q1	# Bell basis measurement
	h	q0
	nop	q1
	measure	q0	
	measure	q1
	c-x	q1,q2	# correction step
	c-z	q0,q2

Example 3

[ test3.qasm |test3.png |test3.pdf |test3.eps |test3.tex ]

# 
# File:   test3.qasm
# Date:   22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - swap circuit
#
        qubit 	q0
        qubit 	q1

	cnot	q0,q1
	cnot	q1,q0
	cnot	q0,q1

Example 4

[ test4.qasm |test4.png |test4.pdf |test4.eps |test4.tex ]

# 
# File:	  test4.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - quantum
# fourier transform on three qubits

	def	c-S,1,'S'
	def	c-T,1,'T'

	qubit	j0
	qubit	j1
	qubit	j2

	h	j0	
	c-S	j1,j0
	c-T	j2,j0
	nop	j1
	h	j1
	c-S	j2,j1
	h	j2
	swap	j0,j2

Example 5

[ test5.qasm |test5.png |test5.pdf |test5.eps |test5.tex ]

# 
# File:	  test5.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - demonstrate arbitray qubit matrix ops

	def	c-P,1,'\m{e^{i\alpha} & 0 \cr 0 & e^{-i\alpha}}'
	def	Ryt,0,'\m{\cos{\theta}&-\sin{\theta}\cr\sin{\theta}&\cos{\theta}}'

	qubit	j0
	qubit	j1

	c-P	j0,j1
	Ryt	j0

Example 6

[ test6.qasm |test6.png |test6.pdf |test6.eps |test6.tex ]

# 
# File:	  test6.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - demonstrate
# multiple-qubit controlled single-q-gates

	def	c-U,3,'U'

	qubit	j0
	qubit	j1
	qubit	j2
	qubit	j3

	toffoli	j0,j1,j2
	X	j0
	c-U	j2,j3,j0,j1
	H	j2
	measure	j3

Example 7

[ test7.qasm |test7.png |test7.pdf |test7.eps |test7.tex ]

# 
# File:	  test7.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - measurement
# of operator with correction

	def	c-U,1,'U'
	def	c-V,1,'V'

	qubit	q0
	qubit	q1

	H	q0
	c-U	q0,q1
	H	q0
	measure	q0
	c-V	q0,q1
	nop	q0
	nop	q1

Example 8

[ test8.qasm |test8.png |test8.pdf |test8.eps |test8.tex ]

# 
# File:	  test8.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - stage in
# simplification of quantum teleportation

	def	c-Z,1,'Z'

	qubit	q0,\psi
	qubit	q1,0
	qubit	q2,0

	H	q1
	cnot	q0,q1
	cnot	q1,q2
	cnot	q0,q1
	cnot	q1,q2
	H	q0
	c-Z	q2,q0
	H	q0
	H	q0

Example 9

[ test9.qasm |test9.png |test9.pdf |test9.eps |test9.tex ]

# 
# File:	  test9.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - two-qubit gate circuit
# implementation of Toffoli 

	def	c-X,1,'\sqrt{X}'
	def	c-Xd,1,'{\sqrt{X}}^\dagger'

	qubit	q0
	qubit	q1
	qubit	q2

	c-X	q1,q2
	cnot	q0,q1
	c-Xd	q1,q2
	cnot	q0,q1
	c-X	q0,q2

Example 10

[ test10.qasm |test10.png |test10.pdf |test10.eps |test10.tex ]

# 
# File:	  test10.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - multi-qubit gates
# also demonstrates use of classical bits 

	qubit	q0	
	cbit	c1
	qubit	q2
	
	h	q0
	Utwo	q0,c1
	S	q2
	Utwo	c1,q2

Example 11

[ test11.qasm |test11.png |test11.pdf |test11.eps |test11.tex ]

# 
# File:	  test11.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - user-defined 
# multi-qubit ops

	defbox	fx,2,0,'U_{f(x)}'
	defbox	fxy,3,0,'U_{f(x,y)}'
  
	qubit	q0
	qubit	q1
	qubit	q2

	h	q0
	fx	q0,q1
	h	q1
	fxy	q0,q1,q2

Example 12

[ test12.qasm |test12.png |test12.pdf |test12.eps |test12.tex ]

# 
# File:	  test12.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - multi-qubit controlled
# multi-qubit operations

	defbox	CU2,3,1,'U'
	defbox	CV2,3,1,'V'

	qubit	q0
	qubit	q1
	qubit	q2
	
	h	q0
	CU2	q0,q1,q2
	h	q0
	CV2	q2,q0,q1

Example 13

[ test13.qasm |test13.png |test13.pdf |test13.eps |test13.tex ]

# 
# File:	  test13.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - three-qubit phase
# estimation circuit with QFT and controlled-U

	defbox	CU,3,1,'U'
	defbox	CU2,3,1,'U^2'
	defbox	CU4,3,1,'U^4'
	def	c-S,1,'S'
	def	c-T,1,'T'

	qubit	j0,0	# QFT qubits
	qubit	j1,0
	qubit	j2,0
	qubit	s0	# U qubits
	qubit	s1

	h	j0	# equal superposition
	h	j1
	h	j2

	CU4	j0,s0,s1	# controlled-U
	CU2	j1,s0,s1
	CU	j2,s0,s1

	h	j0	# QFT
	c-S	j0,j1
	h	j1
	nop	j0
	c-T	j0,j2
	c-S	j1,j2
	h	j2
	nop	j0
	nop	j0
	nop	j1
	
	measure	j0	# final measurement
	measure	j1	
	measure	j2

Example 14

[ test14.qasm |test14.png |test14.pdf |test14.eps |test14.tex ]

# 
# File:	  test14.qasm
# Date:	  22-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - three-qubit FT QEC
# circuit with syndrome measurement

	defbox	synd,4,0,'\txt{Process\\Syndrome}'
	defbox	rop,7,4,'{\cal R}'

	qubit	q0	# code data qubits
	qubit	q1
	qubit	q2
	qubit	s0,0	# syndrome measurement qubits
	qubit	s1,0
	cbit	c0,0	# classical bits to store syndromes
	cbit	c1,0

	h	s0	# create EPR pair for FT meas
	cnot	s0,s1
	cnot	q0,s0	# measure parity of q0,q1
	nop	s1	# prevent cnot's from colliding
	cnot	q1,s1
	cnot	s0,s1	# uncreate EPR
	h	s0
	measure	s0	# measure syndrome qubits
	nop	s1
	measure s1
	cnot	s0,c0	# copy to classical bits
	nop	s1
	cnot	s1,c1
	space	s0

	zero	s0
	zero	s1
	h	s0	# create EPR pair for FT meas
	cnot	s0,s1
	cnot	q1,s0	# measure parity of q1,q2
	nop	s1	# prevent cnot's from colliding
	cnot	q2,s1
	cnot	s0,s1	# uncreate EPR
	h	s0
	measure	s0	# measure syndrome qubits
	nop	s1
	measure s1

	synd	s0,s1,c0,c1
	rop	s0,s1,c0,c1,q0,q1,q2

Example 15

[ test15.qasm |test15.png |test15.pdf |test15.eps |test15.tex ]

# 
# File:	  test15.qasm
# Date:	  24-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - "D-type" measurement
# requested by Nielsen

	def	MeasZ,0,'\dmeterwide{HZ_\theta}{18pt}'

	qubit	q0,\psi
	qubit	q1,+

	nop	q0
	ZZ	q0,q1
	nop	q0
	MeasZ	q0

Example 16

[ test16.qasm |test16.png |test16.pdf |test16.eps |test16.tex ]

# 
# File:	  test16.qasm
# Date:	  24-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - example from Nielsen
# paper on cluster states

	qubit	q0,\psi
	qubit	q1,\psi
	qubit	q2,\phi
	qubit	q3,0

	nop	q0
	nop	q0
	slash	q0
	nop	q1
	ZZ	q1,q2
	cnot	q2,q3
	nop	q2
	discard	q2
	dmeter	q3

Example 18

[ test18.qasm |test18.png |test18.pdf |test18.eps |test18.tex ]

# 
# File:	  test18.qasm
# Date:	  25-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - multiple-control bullet op

	def	MeasH,0,'\dmeter{H}'
	def	Z4,3,'bullet'	# handled specially

	qubit	q0,\psi
	qubit	q1,+
	qubit	q2,+
	qubit	q3,\phi

	nop	q0
	nop	q2
	Z4	q0,q1,q2,q3
	MeasH	q1
	MeasH	q2

Example 17

[ test17.qasm |test17.png |test17.pdf |test17.eps |test17.tex ]

# 
# File:	  test17.qasm
# Date:	  24-Mar-04
# Author: I. Chuang 
#
# Sample qasm input file - example from Nielsen
# paper on cluster states

	def	MeasH,0,'\dmeter{H}'

	qubit	q0,\psi
	qubit	q1,+
	qubit	q2,+
	qubit	q3,\phi

	nop	q0
	nop	q2
	ZZ	q0,q1
	ZZ	q2,q3
	ZZ	q1,q2
	MeasH	q1
	MeasH	q2