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by
Ciro Santilli
(
@cirosantilli,
35
)
Bell circuit
...
Information technology
Information
Quantum information
Quantum computing
Quantum state
Bell state
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Updated
2025-04-18
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Created
1970-01-01
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Quantum circuit
A
quantum circuit
which when fed with input
∣
00
⟩
produces the
Bell state
.
In
Qiskit
at:
qiskit/hello.py
.
Figure 1.
Quantum circuit
that generates the
Bell state
.
Source
.
The fundamental
intuition
for this circuit is
as
follows.
First
the
Hadamard gate
makes the
first
qubit
be in
a
50/50 state.
Then, the
CNOT gate
gets controlled by that 50/50 value, and the controlled
qubit
also gets 50/50 chance
as
a
result.
However, both
qubits
are now
entangled
: the result of the
second
qubit
depends on the result of the
first
one. Because:
if the
first
qubit
is
0
, cnot is not active, and so the
second
qubit
remains
0
as
its input
if the
first
qubit
is
1
, cnot is active, and so the
second
qubit
is flipped to
1
Ancestors
(9)
Bell state
Quantum state
Quantum computing
Quantum information
Information
Information technology
Area of technology
Technology
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