Fast quantum gates with ultrafast chirped pulses
First Claim
1. A method of performing a quantum gate from at least one qubit supported in a quantum register and having a qubit wave function, comprising:
- generating Stokes optical pulses along a first optical path and pump optical pulses along a second optical path;
selecting and shaping select Stokes pulses and pump pulses to form temporally overlapping chirped Stokes and pump pulses; and
directing the chirped Stokes and pump pulses to a select one of the at least one qubit in a quantum register to manipulate the qubit wave function.
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Abstract
Apparatus and methods of performing fast single-qubit quantum gates using ultrafast femtosecond frequency chirped laser pulses are disclosed. The use of chirped pulses removes the demanding restrictions of prior art approaches and allows for the construction of fast quantum gates that operate at speeds on the of order several picoseconds. The apparatus includes two synchronized lasers (pump and Stokes) used to manipulate a qubit wave function in a select manner. Each laser system generates a train of optical pulses. Pulse pickers choose pump and Stokes pulses, which propagate though respective pulse shapers that apply necessary time-dependent phases. To achieve complete overlap between the pulses in time domain, necessary adjustments can be made by using an additional time delay line, which can be located in any path or in both paths.
30 Citations
20 Claims
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1. A method of performing a quantum gate from at least one qubit supported in a quantum register and having a qubit wave function, comprising:
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generating Stokes optical pulses along a first optical path and pump optical pulses along a second optical path; selecting and shaping select Stokes pulses and pump pulses to form temporally overlapping chirped Stokes and pump pulses; and directing the chirped Stokes and pump pulses to a select one of the at least one qubit in a quantum register to manipulate the qubit wave function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for forming a quantum gate from at least one qubit having a wave function, comprising:
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a quantum register configured to support the at least one qubit; a Stokes laser configured to generate Stokes light pulses and a pump laser configured to generate pump light pulses; means for forming overlapping, chirped Stokes and pump light pulses from the Stokes and pump light pulses from the Stokes and pump lasers; and optical means for directing the overlapping, chirped Stokes and pump light pulses to a select one of the at least one qubit to manipulate the qubit wave function. - View Dependent Claims (13, 14, 15)
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16. An apparatus for forming a quantum gate from at least one qubit having a wave function, comprising:
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a quantum register configured to support said at least one qubit; first and second synchronized lasers configured to generate initial Stokes and pump light pulses along respective first and second optical paths; first and second pulse pickers respectively arranged along the first and second optical paths and respectively configured to transmit select ones of the Stokes and pump light pulses; first and second pulse shapers respectively arranged along the first and second optical paths and respectively configured to impart either a positive or negative chirp to said select ones of the Stokes and pump light pulses from the respective first and second pulse pickers; and first and second movable objective lenses respectively arranged along the first and second optical paths and respectively configured to receive the chirped Stokes and pump light pulses and direct said light pulses to a select one of the at least one qubit to manipulate the qubit wave function. - View Dependent Claims (17, 18, 19, 20)
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Specification