We have successfully implemented the most basic oper- ations of this microwave based read out technique. Here we present our experimental results and speculate on fur- ther improvements. Because the operation and ”mea- surement” of the phase qubit does not change dramati- cally in our implementation we are able to base our design on published literature [9, 10, 12]. The basic layout of the qubit circuit is shown in Fig. 1a. We chose a capac- itively shunted phase qubit to minimize the number of junction two-level systems in the qubit spectroscopy and maximize measurement fidelity [14]. In order to ensure long coherence times of the qubit we fabricated the shunt- ing capacitor using an interdigitated comb with the ends shorted together to eliminate parasitic cavity modes [13]. The target value for the shunting capacitor is C$_{s}$ = 2 pF. The qubit loop is designed gradiometrically with L = 625 pH to eliminate sensitivities to stray flux variations and reducing flux coupling to the microwave feedline. The coupling capacitor is chosen to be C$_{c}$ = 23 fF which should limit T$_{1}$ to about T$_{1}$$_{,feed}$ = 2 C/ ( Z$_{0}$ ( ωC$_{C}$ ) $^{2}$) ≈ 180 ns for a qubit frequencies near 4 . 6 GHz [15]. sponse | I + iQ | versus flux in Fig. 3. To better visualize the results we plot the negative amplitude for a nega- tive reset pulse (black) and the positive amplitude for a positive reset pulse (white). Whenever the qubit is hys- teretic (between 0 and ≈ 0 . 45Φ$_{0}$) the frequency response is vastly different depending on which reset pulse was ap- plied, showing that the L and R configurations have very different resonant frequencies. The fabrication was similar to ref [16]. An optical mi- crograph of the fabricated qubit is shown in Fig. 1b. The sample was mounted inside an RF-tight box and cooled down in a dilution refrigerator. The bias lines were con- figured as outlined in Fig. 1c. The flux bias line is filtered with a low pass bronze powder filter, matched to Z$_{0}$ = 50 Ω impedance, with a 1 GHz cut-off frequency [17]. The qubit is calibrated by executing a pulse sequence similar to the one shown in Fig. 2. A reset pulse is ap- plied to the flux line and added to the flux bias line via a DC-block at room temperature. However, neither the mi- crowave pulse ”rotate” nor the subsequent measurement pulse ”measure” is applied to the qubit. The microwave readout signal µ$_{RO}$ is mixed with itself rather than a separate microwave source tuned to the same frequency to eliminate phase drift between the microwave genera- tors. The resultant I and Q signals at DC are filtered and digitized using an Acqiris data acquisition board and av- eraged on board using sufficient averages for acceptable signal-to-noise ratios. We then plot the amplitude re- We now set the DC flux to 0 . 425Φ$_{0}$ which is close to the edge of where hysteresis observed. Depending on the reset pulse two resonance frequencies can be observed. The lower one corresponds to the configuration in which the phase is located in the shallow well (L configuration) - this is the configuration where the qubit is operated. The higher one, ω$_{R}$ , corresponds to the R configuration. We are interested in ω$_{R}$ because this is the expected res- onant frequency after the phase tunnels from the L to R configuration during measurement. From here on all experiments follow standard phase qubit protocols with the only difference being how the signal is measured. In this case we measure the amplitude response at ω$_{R}$ with respect to the reference, defined by the result obtained when the measurement pulse is absent. In principle we only need to calibrate the reference once, but we obtain improved results by continually recording the reference value because of small drifts. Also note since we choose to average the homodyne voltage on the data acquisition card, we are not performing a single shot read out. Due to the 19 dB of attenuation the signal is reduced almost a factor of ten so that the high fidelity single shot ac- quisition times for µ$_{RO}$ would have been prohibitively FIG. 3: Frequency response of the phase qubit for negative (black) and positive (white) reset pulses. When the qubit is hysteretic two resonance frequencies are observed, consis- tent with the L and R configurations. The lower frequency response ω$_{L}$ corresponds to the configuration in which the qubit is operated, and the other, ω$_{R}$ , corresponds to the con- figuration in which the phase particle tunneled during the measurement pulse. The read-out is performed by observing the presence or absence of resonance response at ω$_{R}$ . FIG. 2: Experimental pulse sequence. The flux bias Φ and qubit microwave pulse µ$_{q}$ follow standard phase qubit proto- cols. The microwave read-out pulse µ$_{RO}$ is applied after the measurement pulse is executed for a duration of 400 µs . 2