Abstract
We present a measurement protocol for a flux qubit coupled to a dc-superconducting quantum interference device (SQUID), representative of any two-state system with a controllable coupling to a harmonic-oscillator quadrature, which consists of two steps. First, the qubit state is imprinted onto the SQUID via a very short and strong interaction. We show that at the end of this step the qubit dephases completely, although the perturbation of the measured qubit observable during this step is weak. In the second step, information about the qubit is extracted by measuring the SQUID. This step can have arbitrarily long duration, since it no longer induces qubit errors.
| Original language | English (US) |
|---|---|
| Article number | 054507 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 78 |
| Issue number | 5 |
| DOIs | |
| State | Published - Aug 12 2008 |
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ASJC Scopus subject areas
- Condensed Matter Physics
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Quantum nondemolition-like fast measurement scheme for a superconducting qubit. / Serban, I.; Plourde, Britton; Wilhelm, F. K.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 5, 054507, 12.08.2008.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantum nondemolition-like fast measurement scheme for a superconducting qubit
AU - Serban, I.
AU - Plourde, Britton
AU - Wilhelm, F. K.
PY - 2008/8/12
Y1 - 2008/8/12
N2 - We present a measurement protocol for a flux qubit coupled to a dc-superconducting quantum interference device (SQUID), representative of any two-state system with a controllable coupling to a harmonic-oscillator quadrature, which consists of two steps. First, the qubit state is imprinted onto the SQUID via a very short and strong interaction. We show that at the end of this step the qubit dephases completely, although the perturbation of the measured qubit observable during this step is weak. In the second step, information about the qubit is extracted by measuring the SQUID. This step can have arbitrarily long duration, since it no longer induces qubit errors.
AB - We present a measurement protocol for a flux qubit coupled to a dc-superconducting quantum interference device (SQUID), representative of any two-state system with a controllable coupling to a harmonic-oscillator quadrature, which consists of two steps. First, the qubit state is imprinted onto the SQUID via a very short and strong interaction. We show that at the end of this step the qubit dephases completely, although the perturbation of the measured qubit observable during this step is weak. In the second step, information about the qubit is extracted by measuring the SQUID. This step can have arbitrarily long duration, since it no longer induces qubit errors.
UR - http://www.scopus.com/inward/record.url?scp=49649118181&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=49649118181&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.78.054507
DO - 10.1103/PhysRevB.78.054507
M3 - Article
VL - 78
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 5
M1 - 054507
ER -