a trapped-atom quantum memory (PDF) - MIT

TELEPORTATION: VIA BELL STATE MEASUREMENT
|Φ> = α |↑> + β |↓>
|Ψ> = ( |↑ ↓ > − | ↓ ↑ > ) /√2
ALICE
BOB
| √2 |W> = α (|↑↑↓> − |↑↓↑>) + β (|↓↑↓> − |↓↓↑>)
BELL STATES
DECOMPOSITION
|Β 1 > = ( |↑ ↓ > − | ↓ ↑ > ) /√2
|Β 2 > = ( |↑ ↓ > + | ↓ ↑ > ) /√2
|Β 3 > = ( |↑ ↑ > − | ↓ ↓ > ) /√2
|Β 4 > = ( |↑ ↑ > + | ↓ ↓ > ) /√2
|↑ ↑ > = (|Β 4 > + |Β 3 >) /√2
|↓ ↓ > = (|Β 4 > − |Β 3 >) /√2
|↑ ↓ > = (|Β 2 > + |Β 1 >) /√2
|↓ ↑ > = (|Β 2 > − |Β 1 >) /√2